when the female is wearing a paperbag with a smiley face (drawn or cut out) concealing her facial ugliness while having sexual intercourse. typically used to make up for butterfaces
that butterface would look hotter as a happy helper

M: hey, lets wear masks while we have sex

F (during sex): what happened to your mask?

M: it got too hot, but keep yours on. you look great
by 2fly4wyteguy August 11, 2009
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