One who enjoys the romantic company of animals, specifically dogs. It is common for a Beasty Boy to date a dog groomer in order to have endless access to dogs. Beasty Boys can Be found frequenting dog parks or high traffic dog walker areas.
Did you hear that Scott open mouth kissed his dog? He is such a Beasty Boy.
by SirSpenkzAlot May 26, 2020
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The biggest current disgrace to music (and yes, Dashboard Confessional is still around.)

Unexperienced 10-year old: I heard that there was a time when music was good, what happened?

Experienced 20-year old: The Beastie Boys and Dashboard Confessional fucked it up.

Unexperienced 10-year old: Aw, that is so sad, it's just horrible to think that two bands would ruin music the way they did.
by Silverchair owns August 12, 2006
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1. A female who has both a terribly ugly face, coupled with grossly hairy or unshaven legs. Probably the worst looking specimen of female humanity.

To be an 'ugly face, beasty legs'.
Dude: "Man, that chick is gross."
Other Dude: "I know. A true 'ugly face, beasty legs' is what you have there.
Dude: "I think I just threw up a little bit in my mouth."
by Dude Man Retravision December 8, 2010
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The compex analysis of theoretical problems with no solutions.
Megan: I need some help deriving the isothermal expansion of reversible work.
Joe: Well, just poke the beasty and feed it some grass.
by Alpha sinuclein January 30, 2018
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Beasty Boy is a girl or boy who is beasty of course... and who like to eat roast beast. Beasty Boys is a gang of multiple races who Beast out together.
Watch out for the Beasty Boy gang they’ll Beast you up.
Beast Boys are girls AND boys
by Destiny547 March 13, 2019
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