So, an Oof Face is um... let's just imagine you had a face. Take any face for example. A puppy face, a human face, an Anime face... anything. Now stick the world "Oof" before it. Imagine what would happen. And if you have no idea what would happen, well then scroll down. Don't use the bar on the side, you psychopath.
Oofhead
Oof rapper
Oof shirt
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Disturbing chill face, the relative of an oof face