How did Gimp become a BDSM term?  

Was it because of Pulp Fiction? 
@sean it comes from the pains of using the gnu image manipulation program
@sean I've seen published erotica from the late 70s using the term, so, no, it's not from Pulp Fiction.
@sean it's actually GNU imp, so basically a bdsm sub but with a gpl license
@sean I remember hearing it in that context long before pulp fiction.
@sean I didnt need to know this but thanks I guess 😣