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1.
Waste matter discharged from the intestines through the anus.; feces.
I left muh Defis in the toilet cause i was too lazy to flush it.
by Dubya Bush June 10, 2008
 
2.
Shortened form of "definitely".
"Do you think they'll let me into the party tonight?"
"Defi. You're bringing them a case of Yeung, they'll welcome you with open arms."
by FtG January 08, 2006