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1.
Basically, someone crazy; someone who does or says weird things for no reason.
Dan: I don't know, I just never do my homework for no reason.

Mikaela: Tri-pper! *giggle*
by Mallorey April 21, 2005
 
2.
Acid User
"What's Ryan into?"
"He's just a tripper."
by Diego June 20, 2003
 
3.
someone who trips out weather being on drugs or not
the tripper: "wow that dog has four legs"

average guy: "man your a tripper"
by smakka March 01, 2008
 
4.
taking things out of porportion.
MAYNOR STOP BEING A TRIPPER, I LOVE YOU!
by Sporker. August 31, 2010
 
5.
someone who trips out on you for no reason.
"Dude what was her problem?" "I dunno, she's just a tripper"
by GnarKill April 25, 2003