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1) (v.) To act crazy, outlandish, outrageous, or stupid.

2) (adj.) Of or having the quality or flavor of the Beastie Boys lyrics, humor, or style (i.e. having sarcastic or biting humor, a flippant attitude, use of obscure cultural references, quoting or wearing kitschy and outlandish phrases or styles).
Yo, dawg, dem lyrics is Beastie, yo!

Derek got all beastie and saved his head like MCA.

(This was reuploaded to remove the use of a slur in the old Urban Dictionary definition written in 2009.)
Qwame gets all beastie when he drinks Brass Monkey 'cuz he gets outlandish and up peoples faces.
beastie by unknownuser77 October 10, 2021

Beast mode 

With the male laying flat on the floor, the woman stands over him, legs spread, she bends over with hips only, ass straight in the air, and proceeds to give him a blow job.
"I asked my girl to give me head, she told me to lay on the floor. Then she went in to beast mode, slurping like a giraffe at a watering hole."
Beast mode by GFA Cactus xD October 16, 2021
A way to describe someone who is one sexy motherfucker.
Patricia: "Damn look at Jacob over there."
Becky: "Omg he is so beast."
Patricia: "Agreed."

-AdidasBoBidas
Beast by AdidasBoBidas October 16, 2021

Beast mode 

When someone is being a bit dodgy going for under age quines
Look at that David Preston is talking to a 13 year old, he’s going full beast mode
Beast mode by big boy9281 November 12, 2021
The definition of a beast is Kieran Milne
If u see Kieran Milne in a white van run he’s a beast
Beast by Yer maws a milf November 19, 2021
A beast is a Scottish slag word, if u ever see Kieran Milne run he’s a beast
If u see a guy in a white van usually it’s “Kieran Milne” run for ur life because he is a beast
Beast by Yer maws a milf November 19, 2021