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1. You had better be.
2. You had better do that.
3. Expression of satisfaction.

Also, simply "best."
Albert: "I am a rocker. I rock out."
Ben: "Best be."

Albert: "I intend to give you five dollars."
Ben: "Best be."

"I win at Scrabble! Best!"
best be by Jeff Moore March 12, 2003

Best be outie 

Much like GTFO. Used in a situation where you should probably leave or best be outie
friends mom starts yelling at him/her when u guys are hanging out, you be like "best be outie"
Best be outie by baller31 November 4, 2014

You best be gettin on 

To be told to get away from someone who you may have annoyed.
Yo Jack 'You best be gettin on' yo way away from me!!!
You best be gettin on by Dondre' October 5, 2008

you best be bugging 

Person 1: I just told the principal that I'm going to fist his daughter.
Person 2: You best be bugging!

Ya'll best be steppin'

"Step off." though far less intimating. Really should only be said as a joke, and only with a horrible ghetto accent and (in)appropriate head-bob + finger-wave combo.
"That is one skanky skirt, sister."
"Yo bitch ya'll best be steppin'."
An ironic political hallmark of Melania Trump that is a cry for help like “Stand by your man” as she attempts to avoid her abusive husband.

#BeBest
Melania finds that it would Be Best to avoid upsetting The Donald.
Be Best by Fillip J Rye May 8, 2019