Being the best at something (i.e. relationships, games, dancing, singing, etc.)
John: Shoot the ball!
Ken: *shoots ball and makes basket* I AM THE MASTER COMMANDER! *pumps fist in air at sound of buzzer. Another game won*
Someone who has successfully mastered the art of becoming erect after entering the female body.
The man was a chia master with that bitch!
A pooch is the master of dogs. In their free time likes to wrestle them for food as well as for pleasure.
Lisa is the pooch master
dang boi, he thicccccccc
supa thiccc masta chef
master beef deez nutz