Green’s Dictionary of Slang

chewy n.1

[? one chews at it as one smokes]

[1990s+] (US black/drugs) a cigar or marijuana-filled cigar, rolled with cocaine powder (rather than crack).

In phrases

do the chewy (v.) [? one gnashes ones teeth/chews one’s lips; ? the character Chewbacca or Chewie from the Star Wars films]

[1980s] (Aus.) to become angry.