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It is when you shit so fast that the anus hole cannot handle it anymore and eventually blocks up and then shit starts seeping from the holes in your body.
It is like a cross between diarrhea and constipation.
I saw his face and I shit jammed.
Shit Jam by Stupidism October 30, 2008
Related Words

Jamshitty 

Pronounced Jam-shit-y. Used to demonstrate how dope & legit people are. Or to define shitty jam.
"That jamshitty shit was Naaaasty on that bagel."