A woman's booty that is so big that if you were to vertically slap the booty at a 90 degree downward angle, three of your fingers and 75 percent of your palm would connect with ass
Damn Mike, you see that downward slapper over there?! I bet she could make that shit clap for days!
Hey bro, Mike started seeing a new girl, but she don't got a downward slapper. That shit ain't cool.
Hey bro, Mike started seeing a new girl, but she don't got a downward slapper. That shit ain't cool.
by xo805 December 11, 2020

A saying a person does when another person says an unfunny joke but you're being sarcastic about it, indicating it was the funniest joke you have ever heard in your life. (being sarcastic if you didn't get that)
"Hey Billy, why did the chicken cross the road?... TO GET TO THE OTHER SIDE!" *laughs hysterically*
"What a knee slapper, Timmy!" *slaps knee*
"What a knee slapper, Timmy!" *slaps knee*
by lovelyleftorgan777 May 4, 2022

by Heisenberg308 August 3, 2024

A very long penis that dangles below the knees and slaps the calves when running. May also be used in the plural form to describe low-hanging testicles. See calf slappers
As I ran beside Brad during our workout today, I heard a pitter-patter below his knees. He must have a real calf slapper in those sweatpants!
by CalfSlapper October 26, 2015

by AllHaleBlaise April 16, 2021

by justcallmechickennugget May 14, 2018

by gurt sucker39 May 30, 2025
