D-Spot
A guy's weakness. Punch it and he's out cold. It's like the girl version but for guys and it's super famous from that comic.
I hit my cousin's D-Spot and he was out cold in 3 seconds.
My brother's D-Spot is so weak, I could knock him out with a feather.
That guy got hit in the D-Spot and fell over like a felled tree.