Posher
From the Yiddish abbreviation of Putz Knosher, or dick eater, Posher can mean a variety of things, from pussy to asshole to dick. All that matters is that you use it as a negative expression.
Example:
My Boss, Dave, is a real Posher for making me come in to work even though I had the day off.
My Boss, Dave, is a real Posher for making me come in to work even though I had the day off.