- (slang) A feeling of a drug taking hold.
- An unfavorable card or token, or undesirable or worthless item used as a prize in a contest or game show (such as Let's Make a Deal).
- (transitive) To make (someone) sleepy or delirious.
- (intransitive, usually followed by “out”) To become exhausted, sleepy or delirious.
"After two hours of studying, I zonked out."