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1.
A guy acting in a feminine way.
Every time Gabe doesn't get his way he acts like a sally boy.
by King Swing December 18, 2013
 
2.
A Homosexual male.

More specificly of the flamboyant and whiny type.
Person 1: Look at that whiney homo
Person 2: Who? The Sally Boy?
by Charlie Flamingo December 20, 2007