situational lesbian 

a straight woman who uses the old "i'm a lesbian" line to put off an undesirable (at least in her eyes) guy who is hitting on her. actually, she wouldn't munch the carpet if her life depended on it, but she figures it's better to give a phony excuse to the bozo than to tell him the truth and have it turn out he's a heavily-armed psychopath.

ben: uh, hey jen, would you like to go to the movies with me tomorrow night?
jen: sorry, ben. i guess you didn't know i'm gay. but thanks anyway! (walks quickly ot the other side of the room.)
len: who was that creep? want me to smash his face in for you?
jen: no, he's okay. i just told him i'm a dike and his boner went all soft.
len: wow, you're a real situational lesbian, aren't you? wanna let me fuck your brains out? whoa, looks like i'm too late!

situational lesbian by earpuller November 23, 2010

situational lesbianism 

The state of being where a heterosexual woman enters into a same-sex relationship because of convenience or due to the fact that they cannot find a partner of the opposite sex.

She used to be boy crazy so I don't buy her dating another girl. It's just in case of situational lesbianism.

situational lesbianism by Justnutz December 23, 2013