Top Definition
Where a person goes and jacks off in the bathroom of a High school, palms his semen, walks into the cafeteria, and exacts revenge on a person that mushroom stamped the person who is givnig the semen slap. Then slaps the person, with the hand full of semen.
Greg walked into the cafeteria and semen slapped the shit out of him.

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When having sex afterwards if you finish on your own you jizz in your hand and slap her in the face with the semen in the hand.
Last night my boyfriend gave me a semen slap.
by Chris Ochs October 22, 2006

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

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

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

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