an acronym for "get work done", meaning to accomplish sexual feats with ones significant other; usually used by one guy to another guy around his friend's girlfriend as a bro-code
Ewan: Dude, have you porked your girlfriend yet?
Kennedy: I'm not going to go into details, but I'm definitely GWD-ing.
(Jarrome walks towards the exit doors.)
Kennedy: Hey Jarrome, GWD!