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In a water balloon fight, one balloon is filled up with a man's semen and is thrown directly at a girl's face. Can also she shot out of a water balloon launcher, but must hit a girl's face. Should be videotaped and put on youtube.
(Kid sitting in class)Did you see that girl's face?
(Other kid in class)Yea I heard she got hit by a semen bomb yesterday leaving school hahahahahaha.
by Ayron5588 December 09, 2008
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The vengeful act of crapping on a lover's chest while they sleep.

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a version of the drink jager bomb. a semen bomb consists of a shot of one's sperm in a cup of urine.
Ben took that semen bomb like a man.
by REE-LApSE April 16, 2008
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