1 definition by pandaman24
Someone who always has to beat someone else's story by 'one-upping' them. Such people are usually making these stories up, but seek to lie to try and seem more impressive to the audience of the first person's story.
George to friends: I hit three 3 pointers in a row at basketball
Lee to friends: I hit seven 3 pointers in a row at basketball
Friends: You are such a one-upper, Lee
Lee to friends: I hit seven 3 pointers in a row at basketball
Friends: You are such a one-upper, Lee
by pandaman24 June 13, 2013