When a person is so fat, the only way he can walk is that he waddles. Because he is waddling, it looks like he has got his swag on. But because the large person isn't trying to get his swag on, he is in the act of having involuntary swager; or being a swagatarian.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi