A "Skeenis" is the laziest or lamest dude in a given group of people. It could even be his nickname.
Victor- Hey Jimbo, did you bring me that bottle of malt liquor I asked you for?
Jimbo- No man. I thought you were just joking!
Victor- You're such a skeenis man!
Ulysses- What the hell? What skeenis left these Cheez-It crumbs all over my bed? Oh my...is that a turd?
Dick- Sorry dude. Guess I got drunkadelic with some change I found in your drawers and then passed out in your room. As it turns out, I shit in your bed also.
Ulysses- Good Lord, Dick. You're a real skeenis.