MTBMW

May The Best Man Win: a sportsmanlike announcement made before a game, indicating no bad blood.

Often, the game has no stakes or bets involved, because no sane man would say this if money was on the line.

"Hey John, let's go shoot some hoops for fun"
"Alright Ben, MTBMW"

mtbmw

May The Best Man Win

Example: If you are in a start of a game you can say: gl, hf, mtbmw, and more...

player1: Gl hf
player2: mtbmw
player1: what
player2: google it on urban dictionary
player1: doesn't exist
player2: ok fine I'll make a definition