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1.
Differing from a shit and split, a flush and dump is often done out of consideration, or due to turd insecurity.

The action involves expelling a turd at the same time one hits the flush lever on a toilet.

This is done to mask a noisy turd in a public restroom or to quickly get rid of a smelly turd before it renders a bathroom uninhabitable.
Since it was his first time at her house, Andrew courteously performed a flush and dump in Martha's bathroom, vastly improving his chances of scoring that night.
by Tuftskins April 30, 2009