Strongfat/Bearmode or chubbyfat. Of course I highly doubt this character is either of those, since he sits in front of a computer all day, and talks about his waifu.
I know a dude who's even chunkier than me and was able to lift the back end of a cat off the ground high enough for us to pull another guy out who was trapped under it. And he puts 9 hours on the computer at work each day, then goes to his PC the moment he gets home.
He got his strength by having to lug computer equipment all around a building all day. His fat just comes from eating nothing but KFC. I forwarded this pic to him. Buff Daru is likely gonna be his new hero.
I have a brother-in-law who spends most of his time in front of computers or eating, yet also somehow manages to be crazy strong. Genetics could play some part, considering his son (my nephew) has always been unusually large for his age.