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1.
Short for "episode" in the sense of an argument or a huge row.
Usually preceded by "Don't have an..." it's a slang comment referring to a situation that is about to descend out of all control.
"Oh Niki it was awful, me and James had this massive eppy in the middle of Tesco's the other day"

"Jayne please don't have an eppy, not here and not now. Please"
by Rankles February 18, 2009
 
2.
To get very upset indeed and usually freak out at someone. A violent outburst.

Derogative term derived from "epileptic fit".
"When he saw them together he had a fuckin eppy"
by Twizla February 03, 2005
 
3.
A puerto rican guy who goes to sjsu
my guy EPpy is one cool mutha fucka
by EPpy May 03, 2004
 
4.
It is a slang term for "episode". Used when talking about a TV show.
A: How many eppies of Avatar: The Last Airbender are there?
B: There are currently 20 eppies that have been released on television.
by Nola Bell December 06, 2006
 
5.
Slang for pepperonies.
I like pizza with eppies.
by Cor March 05, 2005
 
6.
1. slang for "epic"
"dude, let's board, guy. conditions are eppies, bro'a. straight pow-pow."
by vandrez January 04, 2008
 
7.
1) An insane man by all accounts
2) Recently died in from a fall after being shanked
3) Ganglord
4) Runs drugs throughout the prison systems of California including but not limited to; Hayward, Folsom, and multiple other Southern California prisons
5) La Primera forever el cardinal
El Cardinal is goin get you homes
by el fuegodor February 01, 2005