Good Point Strong Argument; said when someone makes such a good point that it immediately reverses your stance on the subject at hand.
Man 1: Patrick Swayze fucking blows, he never made any good movies.
Man 2: Yeah Dirty Dancing and Ghost were uber-gay
Man 3: What about Road House?
Man 1: GPSA, Road House owns.
1. Ghetto public service announcement
2. a public service announcement done "the hood way"
3. used to communicate random ghetto messages