Muffin Flop 

When someone is wearing such tight pants paired with an even tighter shirt or vest which makes their muffin top hang over and flap in the breeze.

"Look at the muffin flop on that twink"

Muffin Flop by DrewciferNYC March 9, 2009

floppy muffin 

When a female grabs a man's penis at roughly the 1/2 point of the shaft then proceeds to make a circular motion on the helmet with the palm of her hand... making a once floppy muffin a hard muffin.

"Yo, Meg Ryan gives the best floppy muffin Ever."

"I was at this party and some girl was handing out floppy muffins left and right."

floppy muffin by jeffdhall April 9, 2009