An eccentric; an oddball; a weirdo.

(as also whack) (dated, 70s drug slang) PCP, phencyclidine .

(UK, Liverpool) A friendly term of address.

(originally African-American Vernacular, New York City, slang) Annoyingly or disappointingly bad, in various senses; lousy, corny, cringy, uncool, messed up.