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Flap Stack 

The act of two guys double penetrating a girl by having the girl sitting face forward on one guy (reverse cow girl anal style) and being vaginally penetrated by the other guy facing her.
Michael and Cory totally flap stacked that girl from their acting class.
Flap Stack by giraffeafrass October 11, 2010

flap sweat 

The sweat generated and maintained within the folds of fatty skin on a morbidly obese person, or more specifically, the odor of the sweat-soaked smegma, trapped in an unwashed area for extended duration.
"Oh my god, I can smell that bitch's flap sweat from here!"

Flap Slapper 

A female who in an effort to encourage further vigorous copulation slaps her own genitals as if beating a war drum. Rhythm is usually comparable to the Christmas Carol “ The Little Drummer Boy” with encouraging words in place of the lyrics and vigourous slapping of the hand on the genitals in place of the “Parumpa pum pum” sections.
Dude, Maria is such a Flap Slapper. I can't get enough of her.
Flap Slapper by Peto G June 11, 2011

Flap Smacked

Flap smacked is the act of being hit in the face or head by a flap of skin, usually the size of a large dildo, when log-rolling a patient undergoing a circumferential body lift.
Joey got flap smacked yesterday during Dr. Frankenstein's case.. it was like a knock-out punch from Mike Tyson.

Flap Sack 

Loose skin on your balls do to tiny nuts
Man mark temple has some flap sack showing through his shorts ..!
Flap Sack by Flap Sack April 22, 2021

Flap slap 

I made an advance on my boyfriend, but he flap slapped me because I told him his brothers dick was bigger.
Flap slap by anonymous October 14, 2023