It originated in 2000 around South Gwinnett in Georgia and it means "Definitely" or "Im excited" or "I can't wait"or "For sure" or "Cool beans" or "Im down" or "Im game" or "I will be there" or "Yes" or as an updated version of saying "You bet" or "You betcha" which means you agree and are looking forward to an upcoming event/plans of some sort.
Dude: Are you coming to the club tomorrow night? They said Usher is performing and there will be hella chicks there"
Dude 2: Fuck yeah bet that up!
Dude 2: Fuck yeah bet that up!
by RCCola11581 August 18, 2023
Get the Bet that upmug. 
by msirek June 10, 2019
Get the Betmug. A term linking to “nothing ever happens”, this term can be used after a highly anticipated event/situation does not take place as expected.
Dude 1: Bro, did you hear what Trump’s saying about the Epstein files now?
Dude 2: Always bet on nothing my guy😎
Dude 2: Always bet on nothing my guy😎
by anad1234 July 18, 2025
Get the Always bet on nothingmug. Jacob was getting in his girlfriend Alisha's head for something stupid she did and her friend Taylor standing by listening, opened her mouth and started side betting in Alisha's defense.
by Thiiis Guy! September 17, 2023
Get the Side Betmug. Bet (archaic) used to mean to wager against someone that you are right and the are wrong.
Or can mean that something is definitely true when both parties are in agreement.
Or can mean that something is definitely true when both parties are in agreement.
by Joshamaphone May 10, 2023
Get the Betmug. Jimmy went to a party last night, he couldn't mount a TV so he just drank!
DEF: I bet you cant mount a tv
He could not handle or was able to do cocaine
DEF: I bet you cant mount a tv
He could not handle or was able to do cocaine
by poopypantsaman November 14, 2021
Get the I bet you cant mount a tvmug.