For non-Cuban folks that just moved to Miami: Dale (pronounced DAH-leh) is a slang term, used mostly in Miami. While it literally means "Give it," it's mostly used to mean good bye, or do it, or go for it, or as a slang call. Pitbull says it a lot in his videos.
"Dale is one of those Spanish words that means a lot… and nothing at all. It depends on context. Dale comes from the Infinitive Dar: to give. So it can mean “Give it” or “Do it” or “Go ahead.” Plenty of room for clever double entendres for Mr. Bull." - The Red Angle blog