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The phrase "gettin(g)' your shit pushed in" has a dual meaning. The first (and more popularised use) has already been addressed in the other entries.

The other less well known use means to be shot.

Below, Moreno is asking Jake if he has ever been shot.
Extract from the hit film "Training Day"

Getting your shit pushed in ...

Moreno to Jake : "Hey pig, you ever had your shit pushed in? Your shit pushed in. Simple question."
by AdrianH March 19, 2013