Serious sexual activity. Hardcore and very fast moving with the testicles slapping up against the "taint" area of the female from the seriously fast sex. Usually occurs the most during doggy-style or plain 'ol hyperspeed missionary.

Wow, me and Mandy were having some serious sex, slappynutz were in full effect and I had sweat just fallin off me and my balls. We must have lost 10 pounds each from that 45 minute sexual hurricane.

slappynutz by Schwagner December 7, 2006

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slapnuts

commonly used insult, suggests the person jacks off a lot.

Shut the fuck up, slapnuts.

slapnuts by kb June 26, 2003

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Slapnuts

An idiot who deserves to be kicked in the man marbles and slapped across the face for being such an ignorant fool.

Hey Slapnuts!

Jimmy you are such a Slapnuts!

Slapnuts by John McNally April 23, 2008

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slapnuts

When your pounding a girl so hard your balls slap against her.

Yeah I took her home last night and gave her some slapnuts for dinner

slapnuts by Frank Grimes April 13, 2005

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