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Short for "Break Up, Make Up, Sex You Up." Or the act of breaking up, making up, and subsequently sexing up with one's on again/off again girlfriend/boyfriend.

Appears to have originated in Hawaii high schools in around 2007. Being particularly fond of the word "Bu" (short for "bull", used in casual greetings normally between males), "bumusu" has grown to connote having high sexual prowess with girls. So much so, that you frequently go out with, break up, make up, and sex numerous girls simultaneously and/or consecutively in a calculated manner.
"What's up with you and your girl bro?"
"Eh. You know. Bumusu."

"Hooo bull. How many chicks is that this month? Fuckin bumusu, man."
bumusu by themauirob February 11, 2009
Related Words
1. <i>Adj.</i> Of or relating to the posterior.

2. <i>Adj.</i> Of or relating to the indigent.
1. "Yikes! She's packed on a few pounds in the bumular area there!"

2. "Triple-X Sherry is a pretty bumular drink, but underage kids also like its high alcohol-to-cost ratio."
bumular by Adman12 September 20, 2005

bumusdid 

a very annoying and fat, stupid, idiotic, stinky and immature person who eats lots of food and farts a lot on the sofa while watching TV all day long.
om my days that girl just farted she is a bumusdid
bumusdid by mtesfa54 November 27, 2016
When you tie your bum hair in a bun.
The teacher told me to tie all my hair in a bumun.
Bumun by ashleyboggle July 11, 2019
Bumalik in tagalog
Bumulil ka na uli
Bumulil by Hayst November 6, 2020
Bumulil ka na uli yehey
Bumulil by Hayst November 6, 2020