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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!"

by Jeff Moore March 12, 2003
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2
an exclaimation of your point. a command.
"this will be the best blowjob of your life"

"bitch, it best be."
by sma January 19, 2004
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