One-up 

Someone who always trys to "one-up" you by being better at EVERYTHING. Created by TK & MW (God)

Eg1
Guy: I just shot down the enemy chopper!

One-up: Yeah, I did that with my tomahawk like five times.

Eg2
Guy: I just got my first nuke!

One-up: Yeah, after my first nuke, I got one every round after that for three days straight

One-up by Yodaguy January 16, 2011

one-up 

Inferior to - To do better than - to win - to be "served"

It seemed the other team was always One-Up on us.

Despite her efforts, Sally felt Jane was always One-Up on her in responses.

one-up by ra78 September 30, 2009

One-up 

To exceed expectations.

To do better than someone at something ( the person is generally good at the said task).

Omg I just one-uped the humanities test.

One-up by Arcane15 September 22, 2014

One-up 

To like sb's comment on a social networking site such as Facebook.

"People constantly seek attention and validation through one-upping people's comments"

One-up by MFRO June 19, 2017

one up 

To outdo a deed of another.

I can one up that.

one up by Tailor August 29, 2003

one up 

being better that something or beating something real bad

i think john gonna one up tonny in that fight..or
that backflip off the dumpster is gonna one up jumping off that building in that comp.

one up by Donovan Debrown August 5, 2007

one up 

An extra man, Extar life, something Mario needs alot of.

Dude, if you jump over that piranah plant, over the lava, onto the turtle, bounce off that, land on that tunnel and press 'down' you go in a secret level, there's a one up.

one up by Treg September 22, 2003