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1.
Crazy nut who cant spell

Usually found in the darker parts of cities.
Psyco - Noun
I once saw a psyco, it was strange looking and demented.

Psyco - verb
I Went Psyco on him

Psyco - adgective
Look at that psyco butter.

Pscyo although simular is not the same as psycho.
by NUtcase - 64 September 22, 2003
 
2.
A person or entity who often spams on message boards and chatrooms.

See also Psycho
Psyco is an annoying git.
by misterx September 20, 2003