It is used when you're gonna appreciate someone's service or when you're gonna grab someone's attention and start a conversation with someone who's already busy doing something.
1- Don't be tired! I know it took you a lot of time to prepare this report.
DDDD which stands for Don’t Do Drugs December is a very hard challenge where you can’t do any drugs for the whole month of December. Meaning you can’t smoke weed or cigarettes and you can’t take any pills. The only exception is medecine if you’re actually sick.
Shay: Ya’ll still doing Don’t Do Drugs December ? (DDDD)
Dude 1: HELL NO, I can’t last a day without doing drugs fym??