I look at my girlfriend’s ass like a homeless man looks at a trash can.
Like it’s my next meal.
Girlfriend's Ass
Explanation
Explain Bear
Okay, listen up, dummy. The joke is comparing how much the dude wants to bang his girlfriend to how badly a homeless person wants food. You know, because you are a smart feller, homeless people are not well known for having high paying jobs. Trash cans = food for them. Ass = food for the guy. I had to explain that to you. You are dumb.