When you see a woman from behind, who looks like she is very sexy, but when you catch up with her and realize she is very unattractive or might even be a man.
Friend #1 "Damn, that chick over there is smokin'"

Friend #2 "Nah, man, she has a butterface, because when get up close, you realize it was False Advertising from behind!"
by Pig For A Poke December 25, 2010
Happy St. Patties Day!
when a chick looks hot with sunglasses and takes them off and is ugly
she looked banging outside, but when she came in the building and took off her glasses, she was hella false advertising
by bleezy3 January 07, 2011
Happy St. Patties Day!
when someone or something can be misleading in a certain situation
Moms pulls into McDonald's

Girl: Hey mom are we goin to eat here?

Mom: No I gotta use the bathroom

Girl: False advertising
by Boredingplainjane July 29, 2010
Happy St. Patties Day!