1. who seek to advance the rights of gays in the USA by becoming members of and working for the victory of a political party devoted in large measure to ending all rights for homosexual Americans;
2. devoted to self-destructive irony.
"Great Milt! Welcome! I've got you registered right here! What GOP group was that again?"
"Log Cabin Republicans!"
"Fantastic, Milt! Why don't you go with those two officers there and they'll escort you off the premises! By the way, if you have natural, adopted or foster kids, please write down their names on this card so that Social Services can take them."
"Milt, it's not my damned fault if you're too stupid to read the policy papers and legislation. NEXT!"
Person Two: Really? Isn't he a republican?
Person One: Yea, a log cabin republican. Just like Larry Craig.
Person Two: So, is he also a self-hating bigot?
Person One: Honey, all log cabin republicans are.