Skinna is an abbreviation of the derogatory "Skinner." It is used between skinnas and skinna allies as an affectionate greeting. It means someone who is uncircumcised.
A super-fly extreamly hot female that has a nice tight little body. It's more than an implication that the girl is in fact "skinny" but thats she has attractive feautures across the board.
When you wake up in the middle of the night and your windows and doors are gone. Bonus points if there's a demon who keeps messing around with objects in the house.
Person 1: "Hey, where did the windows and doors go?"
Person 2: "Damn, I think we just got Skinamarinked."
The act of filleting skin, wrapping it around your penis and masturbating with the skin.
"Dude my bitch gave me a Skinnamon Roll last night, it was so hot!"
"That's gross, we're not friends anymore; don't ever talk to me again."
"Whatever man!"