The act of striking one's flaccid penis against their own lower abdomen, in order to create a resonating 'clonking' sound.
It is absolutely essential that the penis is flaccid. The softer the penis, the louder and deeper the 'clonk'.
Having lots of excess foreskin can also have an advantage as it adds a 'whipping' noise to the 'clonk'.
If the tip of the flaccid penis can reach the naval, then it creates a beautiful, deep 'bonk' sound.
Once the slap up has been fully mastered, the 'clonk', 'whip' and 'bonk' sounds can all be heard with one well timed crack of the penis.
Some slap up's can be heard for miles around, and is said to be part of a mating call used by people in certain parts of the world.
Once again it is essential that the penis is flaccid. Striking a hard penis against the lower abdomen can cause the penis blood vessels to burst, bruising, internal bleeding, and even death.
It is absolutely essential that the penis is flaccid. The softer the penis, the louder and deeper the 'clonk'.
Having lots of excess foreskin can also have an advantage as it adds a 'whipping' noise to the 'clonk'.
If the tip of the flaccid penis can reach the naval, then it creates a beautiful, deep 'bonk' sound.
Once the slap up has been fully mastered, the 'clonk', 'whip' and 'bonk' sounds can all be heard with one well timed crack of the penis.
Some slap up's can be heard for miles around, and is said to be part of a mating call used by people in certain parts of the world.
Once again it is essential that the penis is flaccid. Striking a hard penis against the lower abdomen can cause the penis blood vessels to burst, bruising, internal bleeding, and even death.
Pete: 'Hey Dave, can you hear that resonating clonking sound coming from over there?'
Dave: 'Yeah I think its someone having a slap up.'
Pete: 'What makes you think that?'
Dave: 'I can smell it.'
Dave: 'Yeah I think its someone having a slap up.'
Pete: 'What makes you think that?'
Dave: 'I can smell it.'
by Charlieballbag May 14, 2014

The act of slapping one's ass, often in conjunction with one or more ass(es); an insult often derived by pulling one's pants down, instructing someone to place their face vertical to the ground and within the vicinity of exposed ass, and summarily having it slapped by said ass.
by SuperJohnny March 6, 2009

by ElNegro November 5, 2006

1. To masturbate nonstop for hours upon end.
2. To look at pornogrophy continually for hours while insert a male's finger into his own anus over and over, until it bleeds.
2. To look at pornogrophy continually for hours while insert a male's finger into his own anus over and over, until it bleeds.
by Fingeringbutts June 1, 2006

While conducting the Rusty Trombone, you secretly sneak in a ping-pong paddle and slap the recipiant's testicles with a furious rage. When the reciever of this fine maneuver starts to pull away, you will continue with the rusty trombone enticing the person to stay a little longer and repeat the process over and over again.
by Shady S. December 9, 2008

Similar to a bitch slap, but the power of the slap is so strong that it knocks the woman off her feet and lands tits first onto the ground.
by WhyBee May 2, 2008

1. The boy said that the girl looked like Death, and the woman replied, "You better shut up or I'm going to cotter slap the shit out of you!"
by Stichael Johnvin October 22, 2010
