Definitions by mathamattique

crackjaw 

the jaw of those who use crack (typically caused by having no teeth).

people with crackjaw usually push their jaws forward, creating the crackjaw look.
in addition, those with crackjaw can usually touch their nose with their bottom lip. (due to having no teeth)

that dude smoking that pipe has crackjaw!!!

crackjaw by mathamattique September 23, 2022