look up any word, like sapiosexual:
 
1.
To outdo a deed of another.
I can one up that.
by Tailor August 29, 2003
 
2.
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.
by Treg September 22, 2003
 
3.
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.
by Donovan Debrown August 04, 2007
 
4.
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
 
5.
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
 
6.
A derivitive of the term "big ups"
(noun) origin - Jamaican 1980s. singular and plural.
1. An expression of support or encouragement.
2. An expression of remembrance.
"Donald gave Mike one ups on a good play"
by Bilbo Bigguns March 17, 2010
 
7.
To compliment someone, as if you are giving them the 1-UP mushroom in Super Mario Brothers.
Me: *hug* (one up)
Her: Did you just 1-UP me?
Me: Yes, I did!
Her: Aw. Thanks!
by jlpilkin June 14, 2014