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."
Technique of singing, recently popularized by Bob Dylan (done regularly starting circa 2002), that involves raising the pitch of one's voice for the last word or last few words of a line. Generally disliked by his fans.
To hold someone up with a pistol or knife, after demanding they raise, or, "up" they hands. Can end in murder, robbery, extortion or hug. No in-between.