Bet on the wrong horse 

1. To appear to be very sad, down, or upset, as if you had just "... bet on the wrong horse."

Wills:"Sash is lookin' pretty down, man, like he bet on the wrong horse, er somethin'."
Juan:"Right?"

Bet on the wrong horse by Nathan Wakeman April 23, 2008

Bet Lag 

The phenomenon that occurs when the losing party of a bet repeatedly forgets to grant the winning party its winnings due to apparent "memory loss".

Bet Winner: Do you have my 5 bucks today?

Bet Loser: Sorry, it's in my other wallet. Tomorrow for sure

Bet Winner: Damn, you have some serious bet lag!

Bet Lag by lagmaster69 October 14, 2011

bet em up 

"Far out", "that's cool", "heck yea" ,"fantastic", "badass",etc.
Example:"we are not working this weekend" the boss man said
Charlie replies"bet email up,now I can get my yard work done".

Oh it's not supposed to rain today bet em up

bet em up by Stroupster July 30, 2017

bet. Eyebrow! 

when you place a bet saying "bet" a person will respond with "eyebrow" this means that if you loose such bet you have to cut off your eyebrow.

Dude Tom is hella gonna fines you
Bet. Eyebrow!

bet. Eyebrow! by Pseudonymcchs August 26, 2017

Bet a nigga 

When u wanna just say “ ok bet” but you want it to sound more serious and sophisticated.

Devin, if you don’t shut up I’m gonna knock u clean smooth the fuck out.
Devin: ok bet a nigga

Bet a nigga by Tylr97 October 24, 2018

bet upset 

The feeling after losing a bet.

I'm bet upset after my team lost!

bet upset by Ereck Flowers May 4, 2019

Bet-Debt 

when you lose a bet, you enter bet debt.

Everyone starts at 0 and if you win you go up +1 but if you lose you go -1. If you continue to lose, you continue going negative. If you win you subtract from your bet dent and go positive.

She lost our bet and now she’s in bet-debt until she wins.

Bet-Debt by twarfare November 8, 2020