What has happened to a person when they have been outdone by another
Person A: "I just got a 93% on my history test!"
Person B: "I got a 98%."
Person A: "Ok, you one-upped me there."
by Prox March 19, 2005
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Exaggeration of completely made of story of one person to get attention or steal the others thunder. Usually done by a competitive person
Person 1: She just one-upped me
Person 2: Yeah, she just wants attention.
by nbunch81 April 12, 2016
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When one person talks about their accomplishment, another person in their discussion chimes in about how they have either already done that or how they have done something else. Common among friend groups, and acquaintances.
"John needs to stop fucking one upping everyone!"
"Stop one upping and let me tell my story."
by SummerBoi?! December 23, 2017
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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
by Yodaguy January 14, 2011
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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.
by ra78 September 30, 2009
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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.
by Arcane15 September 22, 2014
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