one upping 

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."

one upping by SummerBoi?! December 23, 2017

Facebook Summer "One-upping" 

The period of time right after school gets out, and into the greater part of summer, when people on Facebook must one-up everyone's posts to try to show that they're having a better summer than everyone else.

Person 1's Post: Had a fun time last night, I love summer.

Person 2's Post: Last night was INSANE, this summer's gonna be awesome!

Person 3's Post: Yesterday could NOT have been any better! And today will be just as awesome! My summer is gonna be soooo badass!!

Person 1's Post: Wow it's like a Facebook summer "one-upping" convention.

Facebook Summer "One-upping" by Cody Mu October 27, 2011