“You know why birds fly upside down over here? Because there ain't nothing worth crapping on.”

Simplified Meaning:

In this quote, the speaker uses humor to express their low opinion about a place. They say that even birds, which often soar majestically, don't find anything worthwhile in this area. To joke about this, they imagine the birds flying upside down, making it impossible for them to poop on the ground because there's nothing worth targeting. To relate it to real life, think about a run-down or boring part of a town where everything seems neglected. In this place, people might not care about keeping things clean or well-maintained because they don’t see any value in it. The advice here encourages us to take pride in our surroundings and make them better, so we feel it's worth keeping nice and presentable. By improving our environment, we'll create a place others can appreciate and perhaps inspire them to keep it nice too.