Someone so ugly that even the mere sight of their face is a method of birth control. That is, they are so physically unattractive that they will probably never have sex.
"Oh my god, did you see how ugly that guy was?"
"Yeah, what a contraception face!"
or:
"You're so ugly your face is a contraceptive!"
"Yeah, what a contraception face!"
or:
"You're so ugly your face is a contraceptive!"
by genjon November 5, 2007