An annoying person who responds to hearing someone else’s experience or problem by immediately telling a similar story about themselves with a much more fantastic (or terrible) outcome.
Person: I got to meet James Hetfield before the concert and I got his autograph.
One Upper: Yeah, well my cousin knows the head of security for Metallica, and he got us front row tickets to the show and then we went backstage and met the whole group. Then they invited us back to their hotel room and we partied with them all night.

Person: I have a a dislocated knee.
One Upper: Yeah, well last summer I broke my leg in four places and had to have a steel pin inserted. I also had to have surgery done on my knee to repair the torn ligaments. I was on crutches for almost two months.
by Dawn Davenport December 2, 2004
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A person who always has a better story. If you killed six goats, he or she killed 23. Most of the time they will get angry because you told a story about ONLY killing 6 goats.
Person 1: Wow, this is a nice view. How much land do you own?

Person 2: Umm, I think about 69 acres.

Person 3(One upper): YOU own 69 acres!?!?!?! MY UNCLE OWNS 178!!
by Drew Workman December 9, 2007
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A one upper is one who feels like they need to be better than everyone else, so they constantly "one-up" anything that anyone says.
Chad: Dude, I got a V-6 Mustang today, its Lime Green!
Todd: Oh, but I just got a Roush 'Stang with a supercharger thats laying down 400 to the wheels dawg.
Chad: -_- (gee what a one upper)
by Marcelo D. February 23, 2006
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someone who needs to make themself feel better by making themself seem greater than everyone else

someone who thinks they know everything, everyone, and has done everything you do, but better

-Guy 1 "I built a robotic roach the other day, look,"
-Adrian "So what, my class won a battle bots tourny because of my ideas on how to build it."

-Guy 1 "What is heat lightning again?"
-Adrian "Heat lightning is made when ice particles in the clouds rub together, then the friction it makes creates a lightning bolt"
-Teacher "It's a normal lightning bolt, but instead its red, and makes no sound...Adrian, dont try to be a one upper."
by qwertyismyname December 10, 2007
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A person that "knows" about everything. This person has done everything you wish you had. If you saw it on television last night, he did it for a family vacation 2 years ago.
JON: I had the best BBQ Chicken last night.

ONE UPPER: Ya, I have the best bbq sauce recipe ever. I won an award for it at the fair a couple of years ago.
by Waggs January 18, 2007
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Someone who needs to be better than you because of there insecurities. No matter what you say about anything they will top it.
Say Alec the great tells a story about saving one little panda cub from a three alarm house fire. Dominguez the "one upper" will then tell a story about how he saved Panda's from dying from extinction.
by jordanski April 7, 2008
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-Regarding yourself as better than everyone else, with intent of seeming greater, without actually saying it.
-Implying you have done something long before anyone else even thought of doing it.
-Riding a motorcycle in scrubs and not getting any dirt on them.
-Working 18 different jobs including but not limited to a doctor, a mechanic, a veternarian, and astronaut before the age of 18 (With no proof)
Me: Man im stoked we are getting paid today its the 15th!
Hanson: Yeah well, i get paid 1 and a half hours before everyone else.
Everyone: ZOMG WTF!! How do you get paid 1.5 hours before everyone else, how is that even fucking possible?!!?!?!?!?
Me: Dude, your a fucking one upper.
Hanson: You are all just jealous!
by Smeew March 19, 2007
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