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fart flap 

The triangular rear side window in some smaller cars having a hinge on the front edge and a latch on the back edge that opens about 2 inches.
That fart is horrible! Open the fart flaps!
fart flap by Lord Windowsmear June 29, 2014

Ear-flap phenomenon 

To leave the ear flaps up on an ushanka when it is freezing cold outside.
Men: Whatever you do, don't let your flaps down.

After a night when temperatures dipped to minus 25 Celsius, at least nine out of every ten male Muscovites wore their fur hats Tuesday with the flaps folded up, leaving their ears exposed in various shades of red and blue.

"Are you cold? I'm not, and I've been standing here all day!" said Vasily Chura, a cheerful traffic police officer posted on Arbat Square. As thermometers in downtown Moscow edged to just above minus 20, the flaps on his shapka were neatly tied on top.

"We're Russian people," he added. "We're used to it."

Alexei Kalimov, a 70-year-old pensioner who wisely wore his flaps down, had a more sober explanation for the ear-flap phenomenon. "They are trying to show off their toughness, endurance and manliness," he said as he tapped his feet to keep them warm. "Often they will put on a hat but keep their chests bare, especially in Siberia."
Ear-flap phenomenon by Muzhiki March 8, 2015

p-flap flicker 

When a chic rubs her cooch vigorously with two fingers until she either squirts or cums then flicks her vaginal fluid in the face of anyone close by.
I was minden my business then the bitch hit me with a p-flap flicker
p-flap flicker by Stevie G Spot November 14, 2017

head flap 

A flap or roll of usually fat filled skin at the back of peoples heads revealed by baldness. Usually grows in prominence with age, weight gain, and the relentless pull of gravity.

Plural: Head Flappage

The term "head flap" came to prominence in the mid-1990's when Philadelphia teens would play a game called "Head Flap Slap Crack Trap". The game involved slapping head flaps while sticking opened packets of mayonnaise down the back of the pants. The person had to say "Head Flap Slap" and "Crack Trap" as they were doing the respective tasks in order for it count. When the prankee went to see what was in their pants they often squished the mayo into their pants which was the primary goal of the prank, the head slap being more of a diversionary tactic. This would leave a noticeable white glob that left the prankee with some embarrassed explaining to do.
"Those fools searched my body everywhere for the money but they forgot to check my head flap!"

"What is that smell?" "Gunther probably forgot to wash behind his head flap again..."

"Despite the bitter chill, the back of Walters' head remained comfortably warm due to his impressive head flappage."
head flap by Ham Pony February 20, 2018

Crotch Flap 

Is when Ania hits the net and grunts like a pig... and the power puff girls lose!!!
That was a crotch flap shot she's so German like!!
Crotch Flap by Arm Head June 1, 2018

Muffler Flap 

When your inside a chick and your ball sack covers her butt hole as she farts, causing your ball sack to vibrate acting like a muffler flap.
I hate when my wife uses my ball sack as a muffler flap!
Muffler Flap by BHS Master September 9, 2019