Answer:

gasser

Answer	Crossword Clue
GASSER	Very funny joke
GASSER	Funny joke
GASSER	Rib-tickler

GASSER	Funny joke, slangily
GASSER	Knee-slapper
GASSER	Laugh riot
GASSER	Riot
GASSER	Guffaw provoker
GASSER	Hilarious joke
GASSER	Thigh-slapper
GASSER	Nobelist in medicine, 1944.

GASSER	Real dilly
GASSER	Nobelist in Medicine: 1944
GASSER	Source of yoks
GASSER	Windbag
GASSER	Cause of a mirthquake
GASSER	Nobelist in medicine: 1944
GASSER	Good joke: slang
GASSER	Joke that wows 'em

GASSER	Very funny wisecrack
GASSER	Super joke
GASSER	Joke that causes a belly laugh
GASSER	One very funny joke
GASSER	Quite a joke
GASSER	Real hoot
GASSER	Funny, funny joke
GASSER	Riotous joke

GASSER	Joke that causes a belly laugh, e.g.
GASSER	Funny joke, in old slang