Green’s Dictionary of Slang

(US) an unpleasant person.

2001		J. Stahl Plainclothes Naked (2002) 5: At least the old skeek didn’t discuss his plumbing. [Ibid.] 113: He couldn’t just watch her get perped by a bunch of tanked-up skeeks.
2013		J. Stahl Happy Mutant Baby Pills 132: God, just don’t let that skeek with face sabs have AIDS.