When someone proceeds to jump or sit on an unexpected victims face ass first. A hairy ass is prefered in this process.
I planned to yokozuna Justin Feher's face but his caveman senses went off. So I emeriled him and ran like a motha fucker. He McGyvered a club together and proceed to get his swamp donkey sister.
To jumpass first onto someone's face. Usually most successful if the person is asleep, as to take them by surprise, and get their face all nasty and smelly.