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1.
Nickname given to a woman with jiggly boobs so big her shirt can hardly contain them.
Hey, have you seen the jiggly new waitress they hired? - Oh, you mean Tits a Floppin? I heard they had to call in Omar to make her blouse!
by momjobber October 16, 2010
 
2.
(phrase): a term for female (or some male) mammary glands, often referred to as breasts, that are sagging to the floor due to the force of gravity and bounces in a flopping manner every time the owner of said glands are moving.

(n.): a nickname for someone whose tits are flopping
(phr): your grandma's tits-a-floppin and hit me in the face

by i like stuffffff February 23, 2009