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Hitting somebody or something with all your effort and might.

using either your hand or full body to intensify the impact.

you can also get a running start, that is the true jam smack.
"Cory was standing by the pond so i ran up behind him and jam smacked his ass into the water!"

"if you don't stop talking about football i'm going to jam smack you!"
by dbrown907 January 08, 2010
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