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The sound of your hand and foreskin when your masterbating with exagerated force.

For smaller penises:
The sound of the bottom of your fist hammering at your wet testicle bag.
Just finished watching “50 shades of grey”. Im going home to fapacka now.
fapacka by 0712 February 23, 2018
Related Words

flatpack-palm 

A painful condition - sometimes lasting many days - that often appears halfway through the attempted assembly of flatpack furniture. It can be avoided with the use of an electric screwdriver.
When I made my son's new bed - by the time I'd got 15 screws in, I had flatpack palm - it wrecked !
flatpack-palm by DJ Jaybee September 9, 2004

fatjacked 

A person who is both muscular and fat.
Woah, Tom needs to lay off the bacon - he's starting to look fatjacked!
fatjacked by SuzanneG January 17, 2008

fatback chopper 

Cleaving the buttocks in twain. Similar to a danza slap right along the buttcrack.
The bitch didn't like it in the ass so I had to teach her what's what with a Fatback Chopper.

flatpacking 

The Process of Putting Flat pack furniture (think IKEA) back into its original Box

The process of Un-Flatpacking is removing flat pack furniture from the box and forming it into the product.
Hey Man, I'm moving house, want to help me with some flatpacking? I have an Ikea desk and the original Box
flatpacking by IkeaSwede September 2, 2012

Fratpacker 

Sexual perversion; man who enjoy's spreading his man seeds to others through baking his love juice into cakes and other tasty treats.
A Fratpacker goes into work with a lovely homemade cake, baked fresh that morning. Little do his fellow workmates know, the cake is spiced with several spoonfuls of his very own love juice.
Fratpacker by monkeychamp1981 March 26, 2010