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to go crazy on somebody for no reason what so ever
wtf did he just go phsyo on him for??
Related Words

music phsyco 

Someone who is listening to music almost 24/7, plays 3+ instruments and is overall obsessed with music. Usually weird and listens to metal, rock, punk, and the like.
That girl is a music phsyco, I've never seen her without her earphones.
music phsyco by MetalLover13 December 27, 2008
phst means like ya right..or cha..or something like that.
example: "Do u like me?" "Phst heck no!"
phst by shaniqua evens May 13, 2005

phsycopathetic 

When a chick (usually a prep) pretends to be all crazy so people will think they're all cute and random. They only end up looking like total losers.
Prep A: lollll lyk i no, i'm so crzyyyyyy, babayyyyy!
Prep B: omggggg... no wai ur as crzyyyyyyyy as i ammmm!

Not a prep: Phsycopathetic bitches.

loony phsyco 

the best player in runescape...the guy that saved my life in... in runescape...i was aobout to kill myself online and he...he kept me from not dying...i just want to say thanks again loony, and thank you...for saving my soul...ur thebest of all on runescape...better than zezima in my eyes
loony phsyco saved my life...thanks man =']
loony phsyco by shawn jawn November 15, 2006
Typhoon Jenny will make landfall at 1 AM PhST.
PhST by AnYiv August 27, 2019