1. when you screw a really hairy person.
2. a hairy pornstar.
3. a sexual star wars character who regularly eats shit.
1. Chick Being Screwed: aagh!!! orgasm!!! you are such a Screbacca.
Screwbacca: I Know
2. Woah! look at that hairy, sexy guy!!
Yeah he is a Screwbacca
3. Use the force luke.
i can't i'm looking at a Screwbacca