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1.
1.To produce more semen than can fit inside the woman to be inseminated.

2.Also slang for "entirely owned."
1."Sorry Sheela, I didn't mean to overcum."

2. Will - WTF?
Jake - You've been overcum!
by O.J. Simpson April 23, 2004
 
2.
used in online games to mean "utterly owned"
That was the hardest raping I've ever seen! Seriously, you've just been overcum!
by Sam April 28, 2004