One Shot Kid 

It is what people used to call Uncle, also known as Red Harlow in his youth. He was given this name due to his accuracy when shooting people and animals, as he only needed one shot. This also was given to him due to the nature of his sexual climaxes.

I may have lumbago, but they used to call me the one shot kid.

One Shot Kid by SanFrancisco69ers January 13, 2021

that's one shot kid 

an exclamatory phrase to be used only while you are galloping up the street after putting someone to sleep on the sidewalk

Ronnie: "That's one shot kid"
The Seaside Heights PD: Ronnie, come on over here.

that's one shot kid by TDog Jenkins January 28, 2010