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A souvenir that a bro acquires after getting laid. Usually, but not limited to, a piece of clothing, such as a bra or panties.
Bro #1: "When I woke up this morning I found that Cindy wasn't in my bed still but she left me a nice bromento."

Bro #2: "Nice bro!"

*The two bros proceed to do a very chill handshake."
by Dunks22 July 20, 2010
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