To go off half-cocked or in a willy nilly sort way. A combination of barreling through something and monkeying around.

Most commonly used in an MMORPG while dungeon crawling with a large group whose members who may be apt to act like Leeroy Jenkins and get everyone killed.
"Ok when we get in to Blackwing Lair just stay put and don't go barrel monkeying around in there."
by Harvey Lopez January 10, 2007
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A standard of comparison for describing how much fun something is. The "B of m" is usually considered to be less fun that the great time we are having.
by Nick Cusa September 23, 2006
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What was your favorite thing that happened at the party last night?

I don't know. The whole night was a real barrel of monkeys.
by slamjackson.com June 25, 2010
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To have a lot of fun.
To enjoy oneself, in a crowd or alone.
"Dude, that sounds like a barrel of monkeys!"
"I'm havin' a barrel of monkeys!"
by Bobobo May 20, 2005
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1. boning.

2. The act of engaging in lengthy, wreckless sexual intercourse. Usually involves a number of positions and locations during a single romp.
"Her roommates are gone for break so we played barrel of monkeys all weekend."
by NathanXplosion February 29, 2008
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