When one formerly in a position of weakness or subservience gains power or dominance over his former oppressor. Originally referred to the idea of black slaves gaining power over their ex-owners in the wake of the US Civil War.
A freed black slave in the Union Army saw his ex-owner being led away in chains as a prisoner and said to him, "Hello massa, bottom rail on top this time."
by BGThree March 28, 2008
Get the bottom rail on topmug. by usergillyflower October 14, 2021
Get the bottoming from the topmug. by itsDingbat November 24, 2020
Get the top bottom bitchmug.