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1.
Short for Abbreviation
Him: It's scary how some people use so many abreivs you cant even understand them

Her: Wtf is an abreiv!
by Jasper Danger Ayres-Quirk December 30, 2008
 
2.
Abreiviation for abreiviate.

When one abreiviates every word and then as if to say "lol" says abreiv.
As a way of asssciating the abreiviation.
Ro: What do you want to eat?
Fran: A Ham-San.
Ro & Fran: haha Abreiv.!
by Chesskkaaaaaa May 06, 2008