It's a play on getting fat that looks don't matter. And the only thing going for you is your personality (because you are fat)
1. Refers to gaining weight (fat)

2. Refers to a person that it is not particularly pleasing to look at physically, and the only thing going for them is personality.
Jim: "I am a fat fuck lately, put on 10kgs of personality pounds".

Maria" He has let himself go, in the personality pounds category"
by FattyMcFuckhead2021 November 8, 2021
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