When you're taking a shit in a public restroom and the size, mass, or shape of the shit is such that is causes an updward splash that reaches the genital or anal area.

bidet
A small low basin with taps, on which a person sits to wash their genital and anal areas.
Dan was using the restroom at Dodgers Stadium, and he dropped an ass bomb so large that it was like he was using a poor man's bidet.
by D. Jackson and M. Ward September 14, 2005

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