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Bimu simply means Banana In My Underpants. Used to alert someone that you have an erection and want to hide it.
Guy 1 : Hot girl - 2 'o' clock

Guy 2 : Dude ..... Bimu Bimu

Guy 1 : I'll cover you
by UD Writer June 22, 2009

Words related to Bimu

banana erection in my underpants