Placing your fat beer belly on the back of a women during doggy style sex to relieve pressure on the knees.
Guy1: My knees have been killing me lately during doggy style coitus.
Guy2: You should really try gut shelving to relieve the pressure on your knees, mate.
Placing your fat beer belly on the backside of a desperate stripper in order to perform mediocre coitus.
Guy 1: Man my knees have been really hurting when I do doggy to those slutty strippers.
Guy 2: Brah, you need to be gut shelving those strippers it's done wonders for my knees.