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To hit someone as soon as you see them, usually with someone youre plannin to fight .
Katie: You heard bout Alexis talkin shit bout you ?

Courtney: Yes, I already told her I was gonna deck on sight .

Maddie: Did you see Farrah knock out Sarah earlier ?

Savannah: Yes, It was a deck on sight .
by YasminMayhemBitch October 27, 2012
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