The act of cawing and flapping your arms like a raven while penetrating a female (or male) in the ass. It is key to caw louder the deeper you go to achieve maximum raven flapping. After you have blown your raven load you position the female (or male) on all fours and “peck” your semen out of their ass, letting out a loud raven-like coo after swallowing.
The sound your ballsack makes when pounding a tight slizz from behind; a good sack flap goes to a beat and makes a soft thumping noise... & can lead to minor bruising and irritation of the stomach region of the partner whos tight slizz or smelly balloon knot is being ravaged
Kelly: "Whats that on your stomach?"
Sara: "I had a good Sack flappinglast night"
Kelly: "Oh i got sack flapped last wednesday; and his beanbag bruised the hell out of my tummy "