Heroin.

Also known as Dragon, Dope, Heron, Herone, Hero, Hera, H, Big H, White, China White, White Nurse, White Lady, White Horse, White Girl, White Boy, White Stuff, Boy, He, Black, Black Tar, Black Pearl, Black Stuff, Black Eagle, Brown, Brown Crystal, Brown Sugar, Brown Tape, Brown Rhine, Chiba, Chiva, Chieva, Mexican Brown, Mexican Mud, Mexican Horse, Junk, Tar, Snow, Snowball, Scag, Scat, Sack, Skunk, Number 3, Number 4, Number 8, Bombita, Brea, Blanco, Bonita, Caballo, Calbo, Carga, Carne, Chapopote, Chatarra, Chicle, Cocofan, Gato, Heroina, La Buena, La Chiva, Polvo, Tecata, Tigre, Tigre Blanco, Tigre del Norte, Vidrio and Zoquete.
Snuffaluffagus: "I'm sick, Bird. I need some smack, Bird."

- Dave Chappelle
by ROCKintheCDA November 7, 2010
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Smack On means to propose a fight with someone. Generally in a joking manner but can definitely can be used very effectively in a real situation. Smack On is closely associated with the term "punch on".
Joking:
Luke: "You suck apples"
Brad: "Smack on cunt"

Serious:
Josh: "I fucked your ex on a trampoline!"
Ryan: "Smack on cunt!"
by KinnyMcbinspin February 4, 2014
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Appear to have a quality of something positive or negative
The new iPad smacks of inconvenience.

This party totally smacks of awesomeness!
by Bigg Phill January 27, 2010
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Being high as hell off weed used around Maryland.
A son im smacked like shyt 4real
by Smackedboi October 27, 2009
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