Annoyingly or disappointingly bad, in various senses; lousy, corny, cringy, uncool, messed up.
Every record they ever made was straight-up wack.
An eccentric; an oddball; a weirdo.
PCP, phencyclidine (as also whack).
A friendly term of address.
A few well chosen words such as "Let's be having you wack!", works wonders. The dockers know that they've got a Scouse to deal with. I'm not saying that a Southerner couldn't handle the situation, but the job might well take longer.
A surname.
Back-formation from wacky. Alternatively, possibly a blend of white + black, in the sense that it may appear black on the outside, but it's really white on the inside. Compare oreo.
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