To admonish with seemingly unwarranted severity, usually expressed with righteous indignation.
a. "I don't care if it's 100 degrees out, you're not leaving this house in JUST a thong."
b. "Yo, why you gotta be beastin'?!"
a. "But, mom..."
by jareda May 17, 2005
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An affliction where the symptom is being a beast.
That guy just knocked that other guy out in one punch! I bet he suffers from beastinitis!
by beastinitis April 19, 2011
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Describes something that is overly cool and/or large.
by faeiette June 1, 2006
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Room mate: Damn dude, you think you were loud enough?

Other Room mate: Sorry dude, I was beastin that shit.
by Alay October 19, 2007
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The act of achieving success in a situation where it is virtually impossible to excel, such as finding out who the 70's man on every Incubus album cover is.
"Hey, you know Alex? That beastinator just keeps making up sick nasty bass lines, I've heard them when i was walking by the DiMaio estate the other day.
by vivalasita December 12, 2008
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