Hand Flap 

When you are about to go down on a girl and you start flapping her vagina lips with your hands. Hence, a HAND flap.

Boy: "Are you ready for this babygirl?"

Girl: "What.. WHAT ARE YOU DOING?"

Boy: "I'm hand flapping you babe."

Hand Flap by Maaashaa February 8, 2015

Hand Flapping 

Some children with autism “hand flap” as a self-stimulatory behavior. Other self-stimulatory behaviors sometimes seen in children with autism include rocking and spinning. These behaviors help them calm themselves or regulate their emotional states. Children may also do it when excited or upset, and it can be very hard to distract an autistic child away from their self-stimulatory behavior.

My kid was hand flapping so hard last night that I think his elbows broke!

Hand Flapping by SamDeHam March 14, 2017

Hand flappers 

Those useless batshit human things with big balls from the 2006 book All Tomorrows. They used to be able to fly but lost the ability to, so they just used their big-ass webbed hands for courtship display. They were made because of the Qu’s messed up alien religion.

The hand flappers went extinct because they couldn’t build tools.

Hand flappers went extinct because they were useless.

Hand flappers by Lemur8889 January 22, 2022