The slab is a slang term for an autopsy table. Being on the slab would be a slang term for somebody being dead. Used in "Silence of the Lambs" by Hannibal lector to the senator.
(n) Slabs roll in packs and they roll deep. A Slab is a big body (largely shape boxed body). As long as its big; its in. Down in texas we take pride in our rides like every player should.