What is Phsyco?
1.
to go crazy on somebody for no reason what so ever
wtf did he just go phsyo on him for??
2.
The wrong way to spell
There is no example. "phsyco" doesn't exist.
See
3.
A slang word meaning outragous or very unusual.
Man that guy at the party was drinking like a phsyco.
That was a phsyco rollar coaster ride.