Top definition
Any "bro-d" word, such as "broseph," "Kurt Brobain," "broletariat," or "broseidon." Noteworthy that the word "brortmanteau" is a brortmanteau of "portmanteau" itself. Don't think about it too hard. The ability to create catchy brortmanteaus is a hallmark of a true bro, and doing so will make all the members of his brosse green with envy. Good brortmanteaus are the centerpiece of any brocabulary, and whenever you hear one, you should assimilate it into your own personal ever-evolving bromenclature.
'70s-obsessed bro 1: Dude, I'ma go grab some brocaine and listen me a little bit of Houses of the Broly. You in?

'70s-obsessed bro 2: Hell yeah. Brobert Plant's voice is hella cash on that album, particularly in The Brocean. Count me in.

Random bro nearby: Those were some hella mad brortmanteaus you guys were throwing around. Mind if I join?
by sum lanj? May 10, 2009
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