Define Business Up Front Party In The Back Meaning

He tore off his Caterpillar hat, showing even more of his mullet hairstyle and cried "Yeah lady! It's business up front party in the back!"

After winning the world championship lawnmower races, Earl shouted "Business up front party in the back!" with his dirty-greasy mullet flowing in the breeze. Meanwhile his competitors stood to the side cowering in defeat.