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A smelly, lazy, brainless person who thinks they're the king of the hill. Basically a human version of a half-eaten sandwich.
My neighbor is a jackloaf. He chews gum like it's his job and still can't spell 'Tuesday'.
My cousin is a jackloaf. He failed math twice and still thinks he's a genius.
My boss is a jackloaf. He yells at the printer like it owes him money.