Top Definition
to underestimate the size and/or weight of ones breasts.
be careful not to underbreastimate a women's tits; they are known to suffocate small animals and children!
by Matt Huff October 06, 2011

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the act of underestimating the size of your boobs when trying on clothes
Girl: "I saw this really cute shirt and it looked like it would fit perfectly, but my boobs were practically popping out. I underbreastimated big-time"
by thatsdebateable2014 June 07, 2011

The Urban Dictionary Mug

Lotsa space for your liquids.

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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