The line comes from The Stanley Parable, a first-person game famous for its witty narrator who comments on every choice the player makes. Because the narration is usually calm and polite, a sudden blunt judgement like this stands out and is easy to lift out of context. It has since circulated on soundboards and in short meme edits, where creators use the narrator's detached tone to deliver an insult without raising their voice. That contrast keeps it useful as a quick, understated reaction.
About this sound
The Stanley Parable narrator calls the main character fat and ugly in this clip, used as a deadpan reaction to insults and awkward moments.
The clip is a single deadpan line spoken by the calm, dry narrator of The Stanley Parable, delivered in a flat, matter-of-fact tone that makes the insult land harder than any shouting would. There is no music or sound effect behind it, just the voice pausing slightly before the words as if stating an obvious fact. That contrast between the polite narration and the unexpectedly harsh description is what makes it funny, turning a simple character judgement into a punchline that feels both cruel and oddly detached.