zonk

(noun, verb)

noun

1. 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).

2. (slang) A feeling of a drug taking hold.

verb

1. (transitive) To make (someone) sleepy or delirious.

2. (intransitive, usually followed by “out”) To become exhausted, sleepy or delirious.

- After two hours of studying, I zonked out.