Top Definition
A natural phenomenon by which bros intrinsically congregate. Modern science describes brovity using the general theory of brolativity in which brovitation is a consequence of the curvature of the space/bro fabric.

The curvature of the space/bro fabric is attributed to fact that a single bro has the propensity to naturally bend his relative locus. The bending of the space/bro fabric is a result of bromass. Under these circumstances, bros exert an attraction on one another.
*Empire State of Mind plays...*

Passerby: Whoa... what's going down at the Tau Phi Alpha house?

Another Passerby: I don't know... It's a Thursday night and there has to be at least 70 bros over there. What's the deal?

Speculative Onlooker: It's brovity. The universal law by which bros naturally exert an attraction to other bros. Three bros throw a beer social and in little time they'll attract more and more bros... Natural law my friends.

Passerby: Looks like a complete sausage fest.
by Define Me! February 13, 2010

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