1. [early 19C–1900s] a milestone.
2. [mid-19C–1930s] a tough(-looking) person or creature [SAusE slab, ‘a coarse, axe-hewn plank, two or three inches in thickness’ (OED)].
3. [late 19C+] a sandwich or bread.
4. [1900s] (US Und.) a shop display tray.
5. (US) a restaurant.
6. [1920s+] (US) a stretcher, an undertaker’s table.
7. [1930s–40s] (US) a small town.
8. [1930s+] (US black) a bed.
9. [1960s] (US) a highway.
10. [1970s+] (US black) $1.
11. [1980s+] in drug uses.
(a) weak or impure crack cocaine [? SE (mortuary) slab, i.e. it is ‘dead’].
(b) a large piece of crack cocaine, the approximate dimensions of a piece of chewing gum.
12. [1990s+] (Aus.) a case of 24 bottles or tins of beer.
13. [1990s+] (US black) an automobile.
14. [2010s] (UK black) a block of flats.
see separate entry.
[mid-19C-1910s] (US) a large, stupid person; thus slab-sided adj.
see (long) streak of misery under streak n.
[20C+] (US prison) to fight in private to settle a score.
[2000s] to sell crack cocaine.