Oh well, I've got the GIMP and I know how to use it.
I can even type the above phrase without any second thoughts.
... I once checked a book about GIMP out of the library and got a few strange looks.
It is good to know you can google gimp and the first ten results will all be relevant and work safe.
http://www.urbandictionary.com/define.php?term=gimp
See the second entry if the slang is unfamilar to you.