Top Definition
When 2 or more guys are running together with no shirt and short shorts.
I was walking the other day and I saw 2 frat guys brunning together.
by benji howland September 06, 2009
Verb; a very boring person
Come out tonight, stop being a brunning.
Don't be so brunning, cheer up.
by elizabeth smith66 January 22, 2011
bunning + running = brunning, or, to brun. it's free running, aka parkour, but stoned. note: always attempt above a soft surface.
brunning makes me catch bare jokes.
by Judge Fudge September 20, 2006

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