The "oof" sound effect wasn't made by anyone at Roblox; it was actually made by a man named Tommy Tallarico. Tommy has worked in the video games industry as composer - meaning he made the music ...

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Additionally, Tallarico has created a sound effects kit for the game that Roblox developers can use, with the price ranging from $10 to $250 depending on how many sounds are purchased.

The sound effect is hugely popular, and is well known in and out of the Roblox community - it has been used in countless memes and videos around the world.