Meaning #1: Whilst fucking your girl from behind, pour beer on your crank and use for lubricant. (WARNING: This may cause yeast infections).
Meaning #2: I new fad diet in which you only eat hot dogs and drink beer. Common exercise for this diet may include: Sitting around and doing nothing or playing beer pong and hitting onugly bitches.
"I need to buy more beer. I was beer dogging your momlast night and i ran out."
"Dude i love my new diet! all you have to do is nothing i don't normally do."