Top definition
Tits that are so big and/or floppy that they make a fapping sound when they bounce. Usually this happens when they fuck laying down.
She has really nice faptits. I like when they flop around when she's running.
by undefinedwerd October 05, 2012
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug