Oof

Oof is originally a sound from Roblox when the character dies. Oof can also be used as a placement or a word that can't be described as a response to something negative verbally or physically done to another person.

"I was about to make-out with Name and then my parents walked in." Person 2: Oof
"I bought a new phone than instantly dropped it breaking it unable to replace it" Person 2: Oof
"Bastion made play of the game" Person 2: Oof
"I was killed by a Teemo shroom" Person 2: Oof
"The tank didn't taunt and I died." Person 2: Oof