Apendix of Terms taken from Heinkle's 25th century Dictioanry (not Alhpabetical order):
Xeno: Xeno, short form of Xenobiological or Xenoterrestrial,
1.meaning not human or of Earthly origins.
2. Slang form of Xenoterrestrial
3. Derogative word for alien species
I-Laser: Short for Intensive Plasma Laser
ShellBuster: Term used to describe an explosive charge capable of breaching a hull.
Credit: A unit of Icaran Currency.
Crowns Crowns refers to a coin used to represent 5 credits.
Billy Hopper: A citizen of the Empire unauthorized for interstellar flight, who hides on a interstellar transport. The term "Billy Hopper" comes from the fact that the first recorded case of such action was taken by a man named William, the hopper refers to the fact that most of these "Billy Hoppers" must stow away aboard several ships before reaching their destination.
Mutant: Describing one who has mutated.
1. A human being who has suffered genetic or biological mutations of some form.
Xenocide: Refers to the systematic annihilation of a non-human species.
Slambred: Slambred, meaning one bred in a slam or maximum security Penal colony. Slambred citizens are often drafted into the Icaran marine corps or Imperial Guard regiments, following extensive "re-socialization" processes.
Re-Socialization: A series of drug, hypnotic, and brain print treatments which allow an otherwise unsuitable citizen to operate as a normal human being.
Joey: A marine
Bootstamp: Referring to the imprint left after a kick from an Icaran Jackboot, meaning chewed out by one's superior. ex: "John just got a bootstamp from his Commander for sleeping in."
Dancing a Molly: Refers to a hanging, the standard sentence for traitors and heretics.
Sweetjuice: Slang term for an illegal Phong drink which has intoxicating results on said species, and toxic results to humans.
Heretic: One who defies the existance of the divine, an atheist, a cultist, or one who has defiled the name of the Praetors.
Blackshirt: Slang term used by military personnel to refer to a State Security trooper.
Dragger: A dragger, an unproductive citizen, a lazy individual.
Warping Willies: A humorous name for warp sickness, caused by the effects of the warp on some humans.
Bouncing Brenda: Slang for a landmine used by Icaran State Security, it pops up from the ground prior to exploding when triggered.
Kissing Steel: Slang term for being slapped by the flat of a sword, punishment inflicted on undisciplined recruits.
Spanking Anna: Crude Slang for slapping a charge/magazine into a rifle, origins unknown.
Darter: Weapon used by State Security and Ship Board Marines. Fires a micro explosive "Dart" at transonic speeds via magnetic acceleration.
Auto-Rifle: Refers to an automatic darter assault rifle carried by SS and Fleet Marines.
Green Meanie: Stimulant pill used by the military during long periods where sleep is not available, side effects include explosive vommiting and diarrhea after prolonged use, as well as headaches.
Vac Suit: A soft form fitting suit worn over clothing aboard starships during combat incase of sudden exposure to vacuum.
Hard Suit: Refers to a Marine or Army armored Vac suit.
Slasher: Slang term for an energy blade carried by marines for hand to hand fighting aboard ship.
Charlie Foxtrot Polite version of Cluster ****, used to describe a situation where an officer who does not know what they are doing is placed in charge of those who do. See also goatscrew.
Slam: Maximum Security Penal colony.
Halfer: A being of mixed species, also classified as mutants.
Glassing: The destruction of a world by orbital bombardment, comes from the fact that energy weapons and fusion weapons turn soil to glass upon impact.
OpFor The Opposing Forces
Burner: Used by navy pilots to describe afterburners, by land forces it is used as slang for a flamethrower.
Bessy: A Mk12 Bessamalt Arms assault Rifle.
The State: Refers to the body politic, government as a whole throughout the Empire.
Nugget: A new pilot
Mud Eater: A ground pounder, generally army personnel.
Expect a New Chapter soon 
btw you guys don't mind me going a little off game for a bit do you?