This is a meme that was created by a video showing a man saying the words:
"Oh you playin' minecraft?
I like ya cut, G." before proceeding to slap a bald child
on the back of the head.
This is often used as a phrase before slapping a person (often someone that recently had a haircut)
on the back of the head.
Source: youtube.com/watch?v=2TA6rSkPMPA