H-clap 

When performing a H-clap a female is giving a blow job to a male while she is recieving it from behind by another male. During this sexual activity the two men clap hands over the top of the female. The only way this activity is truely considered a H-clap is if the two men slap hands.

My buddy and I were H-clapping this chick at a party and before we clapped hands people just thought we were doing an ordinary eiffel tower, but once we clapped everyone cheered.

H-clap by Dome is Dome December 10, 2009

H-Clap 

One guy getting his nob slobbed from the north, while his buddy tags her from the south. At this point they both give each other high fives.

Dude #1:
"That H-clap was really awesome last night."

Dude's Buddy:
"Yeah, she was locked up tighter than a pair of Chinese finger cuffs."

Dude #1: "Go Bengals!"

H-Clap by Delbert McClinton December 8, 2003

Clapping H

A sex act involving two guys and one girl. While the girl is on all fours, one man gets the chick from the rear section, the other "face fucks" her. While thrusting, the two men clap their hands over top of the girl. Their bodies form the letter 'H', thus creating the Clapping H.

Dude that total slut let me and my dude complete the Clapping H

Clapping H by JohnnyApple January 3, 2005