One is crackle-smackin when wearing a new set of veneers that are much appreciated by homeboys, haters, and ratchets of the community... The veneers must be made of porcelain (known by some as crackleware) and emit a florescent glow when compared to it's immediate surroundings.
The -smackin suffix refers to the proximity of the veneers to the lips and mouth
Person one: Ay mang, what dat be?!?! Da po-po spotlight o something?!
Person two: Naw G, that Rae Rae new grill n shit!Think he dropped a band on dem thangs...
Person one: Crackle-smackin!!