1 definition by katmarie

Top Definition
Boob shaking laughter .A joke or comment so funny that it makes you laugh so hard your boobs shake.
That joke caused some major BSL.
by katmarie January 06, 2011

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