The sacred oath that takes place between two bros in which each man takes the phallus of the other and proceeds to slay the dragon.

If the oath is broken, the phallus of the oath breaker shall be violently removed.
Ex 1: *While playing hearts*
Gareth:"Bro I promise I don't have the queen of spades, you can play that king."
Pierre: "I do not believe you"
Gareth: "I will BroShake on it"

Ex 2: Marwan and Michael secured their promise to not look each other in the eyes during their 3-way with a BroShake.
by Cotopaxi2014 August 13, 2014
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The first handshake you have with another man. Usually reveals a lot about them
Yo dude, that kid Andy has such a weak broshake. Lame!
by InvaderRen April 12, 2009
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A bastardization of the "brotha shake" that expressed solidarity among black people in the civil rights movement and a result of the diffusion of hip hop to mainstream culture, the broshake is a replacement of the handshake that bros use for formal introductions or to express bromantic sentiments.
I feel so awkward at this party because all the bros keep giving me the broshake and I mess up because I don't know how to do it.
by 2PakJack (not tupac) September 13, 2008
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