DGTB

Do good today bitch!

DGTB is used to encourage someone (e.g. a close friend) to succeed in their day.

A close friend: Morning.
U: Good morning!
*talking for a while about meaningless things*
A close friend: Hey, I have to get going. My class is starting in 5.

U: Sure, do good today bitch!

Used often by the youtuber Jermbot at the end of his videos to encourage his followers.