the act of quietly squeezing out a fart when sitting down by leaning to the side slightly and raising one cheek.
My girlfriend always knows when I fart because even though I do the one cheek sneak, I always give it away with my farting facial expression. Not to mention that the room also smells like a fucking animal died in there!
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 fuckingone upping everyone!"
"Stop one upping and let me tell my story."