When you get to know a girl and may be have a flirt, too and she suddenly turns colder and tries to unobtrusively place the words "my boyfriend" in the conversation she is boyfriending you to impact that you do not have a chance to score.
Usually this happens when you have done something that made her reconsider (in this case often there is no boyfriend) or she did not have a drink for more than half an hour and begins to have second thoughts about cheating on her (existing) boyfriend.
Boyfriending:
You: "Did I tell you that i travelled the world for the last couple of years?"
Her: "Aaah, that sounds interesting. My boyfriend went on a three weeks vacation last year too."
Ruler of Lake Titicaca. Rumored to have a bunghole that gets very angry if it does not receive toilet paper. Cornholio the Great is often seen walking around with his shirt over his head and his hands in the air, chanting songs about his power, and his bunghole.
"I am Cornholio! You do not want to face the wrath of my bunghole, for I need TP!"
Butthead: Shut up, Beavis! (uh huh huh huh)
Beavis: Um, okay. (heh heh heh heh).