RhymeZone: jimjam definitions

Definitions of jimjam:

noun: Placeholder word for a thing or person nonspecific, unknown or forgotten; thingamabob.
noun: Nonsense; rigmarole.
noun: Chaotic activity; uproar; craziness.
adjective: Crazy; insane or befuddled.
verb: To cram together in a jumbled fashion.
verb: To befuddle or stupefy.
verb: To dance ecstatically.
verb: (euphemistic) To copulate.

(Definitions from Wiktionary)