unplanned spontaneous sex
It was sperm of the moment so I forgot to put on a condom.
by Kenric October 18, 2006

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Top Definition
Describing an act of sexual intercourse that was unplanned, completely spontaneous, and performed without any foresight whatsoever.
Bob: Dude I met this girl from Kentucky last night, asked what her name was, didn't get an answer, brought her back to my lair, and then banged her guts out.

Dave: Sounds like that was totally sperm of the moment.

Bob: Yeah, it sure was.
by busdriverboris3 June 18, 2009

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The Urban Dictionary T-Shirt

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The act of messing around/flirting with a girl (or guy) simply because your bored or no one else worth messing with is around. The act occurs spur of the moment.
-Ey man, why was you messin' with her all yesterday?
-I dunno, sperm of the moment.
-Ohhh, I gotcha.
by C-Hud July 26, 2005

The Urban Dictionary Mug

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt