it is a term used to describe a clutch incident for someone that possesses "swag".
Ex:
(while playing monopoly)
One: Oh man, you are so going to land on my hotel properties this turn.
Two: Nah, that ain't me. I am going to roll a 7 and land on free parking.
(Rolls a 7)
Two: SWAG SLIDE!
18👍 2👎