Top Definition
animating each and every single frame of breast movement with love and passion.
joe: did you see the last part of the movie of tengen toppa?

random guy: yes, they use the gainaxing in the yoko breast very well
by zenki1389 April 02, 2010

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A law of physics generally attributed to Anime, in which breasts move independent of gravity and jiggle absurdly with even the smallest motion.
"Dude, did you see that chick?" "Yeah, she was Gainaxing so bad, I thought she'd get a black eye."

"I would run more often, but not even my sports bra can stop the gainaxing. it really hurts my back."
by Chaosweaver November 01, 2012

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

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

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt