"Wankish" has been used to describe an RPG character's alignment ("what's yer alignment?" "wankish" "as opposed to good or evil?"). But more generally, it indicates a general condition of wankery. Similar to wanky.
"Jimmy says...." "I don't give a fuck what Jimmy says, that wankish cunt can go fuck himself in the arse with a chainsaw."
A compressed version of the phrase "wait to finish" in an effort to save times, and allow for one to simply exclaim "I can't winnish!". A form of gibberish, and often a byproduct of impatience and fast speaking when college teens write papers last minute.
A girl, Scarlett, is writing a paper and exclaims, "I cannot winnish this paper so I can sell my textbooks!"