oof

expressing discomfort, as from sudden exertion or a blow to one's body.
also used as a meme. (when you die in roblox, *Roblox is a massively multiplayer online and game creation system platform that allows users to design their own games and play a wide variety of different types of games created by other users. The platform hosts social network games constructed of Lego-like virtual blocks, your character makes a "OOF" sound.) *popular in most states.

"my roblox character makes a OOF sound whenever i reset in obbys."
"when i fall down, i make a OOF sound."