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3.
Where you wait on an overpass over a highway with a bunch of shit and then try to drop turds so that they will fall on the cars passing underneath.
Lets go shit bombing.
by The Fury 13 November 30, 2010
 
1.
Putting feces in an almost empty shampoo bottle, add water or urine. Shake the bottle and spray it on your victim.

Mostly done in prison
On the bars I could see a brown substance which were the remains of fellow prisoners shitbombing each other.
by Prison Kikel May 13, 2009
 
2.
A tactic used by Anarchist and other antiestablishment groups.
There they put shit in the bomb bays of bomber planes and then fly over a large city etc. and drop shit on it.
Let's do some shit bombing.
by Judge dredd7 October 05, 2011