Literally, an explosion of cum. Cum that shoots the accordian right off your lap, and the Santa hat off your head.
"Richard pumped the accordian on his penis, until he enjoyed a fine CUMSPLOSION. He was so rubber-legged he fell on the icy walk as he left. Best Christmas ever.
by kevmulk September 17, 2008
a. While having sexual relations individuals involved simaltaniously orgasm.

b. to cum together
Nick and Beth had a cumsplosion while having sex in the shower that could be heard through out the apartment.
by Teddy H. December 07, 2007
When a male ejaculates profusely covering everything in the way of his cum shot.
guy #1: I'm gonna need like 50 more rolls of paper towels in that bathroom!

guy #2: What happened?!?!

guy #1: cumsplosion....
by backstreetFORlife September 27, 2009

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