Definitions by Jonutz
Onion lip
A sexual act where a man go's down on a female and notice's a nasty taste or smell, he than after tasting it kisses the inside of her thigh, then go's up n sucks on her lip so she has to deal with a nasty taste and odor for the next few hours not knowing what it is, when in actuality its the smell of her rotten onion on her lip.