The smile that a longterm crackhead/cokehead displays due to missing teeth. The remaining teeth are spaced out with the gaps from missing teeth very obvious, thus resembling a classic Jack O' Lantern carved mouth.
I once worked with a super cokehead, Andycaine, who has a Crack O' Lantern grill.
by Joey Paisan July 18, 2011
Can you define these popular missing words?