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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 22, 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

-ADRIAN CLEEK OF DALLAS TEXAS
-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 07, 2008
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Someone who has apparently had everyone elses experiences happen to them, but much better or much worse. Often this is because they need to be better than others or feel the need to be 'one-up' from everybody else.
Sophie: I got totally drunk and ended up falling asleep on a bench!

Jess: Yeah that happened to me but I woke up in a lion's cage and proper fought it off with my judo style skills. All with a hangover too!

Sophie: You are such a one-upper!
by Gregor McGregorson September 07, 2009
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Of or relating to a person always trying to outdo or claim that their experience was better without regard to whether it actually was better.
Torrey said that he had an excellent vacation in South Beach. Andrea then chimes in and says she had a better vacation in Iowa. This illustrates a one up and a one upper.
by JRoddd April 10, 2009
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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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