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1.
To replace an individual within a particular position or standing who was not performing well, usually in sports.
He was the starting quarterback, then he got slabbed.

I used to go to Church's, but I slabbed them for KFC.

by J.Hayes September 28, 2005
 
2.
(coins) To be authenticated by a pro and put in a plastic case.
I bought a slabbed coin but it still turned out to be fake.
by Ginkgo100 July 30, 2011
 
3.
what's happened to a house that was knocked off its foundation by a hurricane.
Our house was slabbed by Katrina.
by Una Malachica January 30, 2008
 
4.
To be hit with a concrete slab.
Oi mate if you keep annoying me you'll get slabbed
by evil2010 June 12, 2010