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!"
A very dumb and spontaneous exclamation clarifying the time, usually occurs when good slang is on the tip of one's toungue but cannot be thought of correctly.
Jake: "Well, it's 3:30 on the smack..."
Gabe: "you mean to tell me?"
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