that's exactly what I picture, too. :-P I also mentally put him in overalls, sans shirt.
It's funny for me because I have an adorable relative Angus nicknamed Gus. You'd think some cute little kid would take away that connotation but it hasn't.
A few years ago I lived in the dorms for university and was down the hall from two guys, Bob and Gus. At one point someone graffitied their door with "Boob and Gas." That really adequately sums it up for me.