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1.
insane; crazy; madd nuttz
That bum that attacked Mark was totally tiffy.
by Gappy May 14, 2007
 
2.
"It's tea and tiffy time." or "Is that a tiffy you're smoking?"
by AliceDD September 10, 2012
 
3.
touchy-feely, touching people when you talk(adj.)
I wouldn't talk to him he's really tiffy.
by Kelsee Jean October 28, 2008