adj. Anything cunning, sneaky or underhand.
n. A deceitful, slimey or unscrupulous person; a thief or a conman.
Todd "Where's my wallet?"
Keith "I dunno, but there was a greasy old guy walking very closeley behind you five minutes ago, and he looked like a snave to me."
Todd "I think I saw him - short-arse, string vest, hairy arms?"
Keith "That's the one. Look, he's over there by the grocery stall, go get him."