What does "let's delta" mean?

Let's delta is informal slang that means let's leave, let's get out of here, or let's depart quickly. It comes from military and aviation culture where Delta is the NATO phonetic alphabet word for the letter D, which stands for depart. It gained popularity from the phrase Delta out of here, meaning get out. In business and tech culture, especially in Silicon Valley and startup environments, let's delta is used as a quick, casual way to say we should wrap up and leave a meeting or location. For example, after finishing a lunch, someone might say let's delta. It can also mean to delete or remove something, playing on the mathematical meaning of delta as change or difference, but the leave meaning is far more common. In some gaming communities, delta means to exit a game or server. In military contexts, to delta can mean to move to a new position. The phrase is not standard English and is considered jargon or slang, so it may not be understood in formal settings. It is similar to phrases like let's bounce, let's dip, or let's jet, all meaning let's leave. If someone says let's delta out of here, they are suggesting everyone should depart together and move to the next location or end the activity.