The embarrassing(and sometimes painful) act of your balls hitting against your thigh or leg while walking or running
Me: Dude, I was running my 5k when my balls started hurting

Friend: Sounds like The Flop-Flop
by Brett50Cal July 11, 2012
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a male dance... when he on the hard, he makes, his yeah flop up and down
"Kevin did da flop-flop at da playground... It was so small, it aint even look like it was movin!!!"
by Destinee March 3, 2005
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Flop flop nigga means you wanna smash someone
Sit: havr you sern my sister
Jason: yes shes very nice
Getrenv: yes shes smoking hot, i want to flop flop nigga her.
by SitInYourRoom July 5, 2020
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A lps (littles pet shop) puffin flying in the air
Person:Is that a plane Superman no it’s puffin

Puffin: flop~ flop~
Sound effect * flop~flop*
by Littlest pet shop PUffiN October 3, 2020
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