One Punch Man [Chris Hallbeck]

Ok so basically there's this guy who always has one cup of punch whenever he goes out to party's. He never ever gets a refill ever. Anyways everyone calls him one punch man because hes like really strong and kills everyone with one punch.

I've been meaning to check it out, but I guess now I don't have to.

It's watermarked in the second panel though

I always put the source in the title in case anyone wants to look them up.

There's an anime/manga called One Punch Man...a man so powerful he defeats all foes in one punch.