The second most common use of the word refers to a... well, a character in the movie "Pulp Fiction". I'll let you research that one.
He is the guy in the black leather suit in Pulp Fiction, typically associated with "alternative" sexual preferences. (Some misuse reported here: http://www.puxedo.org/blog/archives/000032.html)
AFAIK, this is really slang, http://dictionary.reference.com/search?q=gimp doesn't turn up anything of this nature, although the origins of the word are quite nicely laid out.
Jaco
