Definition of "bummer"
bummer1
/ˈbʌ.mɚ/
noun
plural bummers
bummer2
/ˈbʌ.mɚ/
noun
plural bummers
(slang, dated, drug use) A psychedelic crisis; hallucinogenic drug use producing undesirable dysphoric psychological effects, most often fear, paranoia, and especially horrifying hallucinations; a bad trip.
interjection
(colloquial) Exclamation of annoyance or frustration at a bummer (disappointment).
bummer4
/ˈbʌ.mɚ/
adjective
comparative form of bum: more bum