One who possesses the ability to clog someone's toilet to the point of OVERFLOW (not merely backup or slow flush) causing shitty water to cover the entire tile floor and parts of the adjacent hallway carpeting. This is not intentional, and happens despite multiple courtesy flushes throughout the act leading to the final shitmastering flush.
Dave: (Running out of the bathroom) Where's your mop bro?
Me: What? Why?
Dave: Your toilet's overflowing man. Shit is literally EVERYWHERE!
A swagmaster is someone who has so much swag that it is almost unbearable, they have the greatest amount of swagger possible to mankind, and it is very rare to see one. IF you do happen to come across a swagmaster, be respectful!! if you arent, him&his possy will overpower you with their swag. and you dont want that to happen.
kelly: "yeah so i was like he-"
melanie: "OMG ITS THE SWAGMASTER."
swagmaster: *sup nod*
kelly&melanie: "oh... my... god. we were just acknowledged by the swagmaster."
The coolest person in the world. There is only one of them and they are the most amazing person you will ever meet. It is an honor to look them in the eye.