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4.
This is used to say goodbye or see you later.

l8er is read; L EIGHT ER, later, short for cya later.
<1 Says> Well I gotta go
<2 Says> Alright peace
<1 Says> l8er
by X November 02, 2003
 
2.
Term used in a chat service. A creative way of saying "Later" as in bye.
yo i have to go.

L8er
by Brampton December 02, 2005
 
3.
short for later wich is short for see u later
Billy Martin: I've got to go.
Me: L8er
by Billy Lover June 02, 2005