1. The act of proposing to one's closest bro. It is an entirely heterosexual act, and requires the same level of commitment to eachother as in that of a bromance.

2. The act of putting forward an idea to one's bros.
1. Dirk: "Yo Brent, how was last night?"

Brent: "Oh it was rad dude, Chad totally broposed"

Dirk: "Wow that's awesome dude, i'm totally happy for you two"

2. (Dirk gets up at the table)

Dirk :"Gentlemen, i wish to bropose something, we should totally have a bro and sack night at mine this friday"

All : "What an excellent broposal"
by Bro-EE3 December 07, 2009

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