1.) <direct command; imperative> a streamlined and highly economical verbal jab that efficiently informs the receiving end to—in the following order—(a) step the fuck off, (b) shut the hell up and (c) mind their own goddamn business without actually having to use any profanity oneself.
as found for virtually every 4 word command, one may also come across "SUAC," or the acronym version of the phrase.
2.) <adjective> may also be used as a modifier to describe a nature, behavior or policy of willful ignorance; to turn a blind eye to something/someone.
1-b.) "hey what's behind that door that says RESTRICTED: FOR AUTHORIZED PERSONNEL ONLY anyways?"
"nothing. go shut up and color."
2-a) "even though he knows all about the ceo embezzlement, the vice chairman's inclinations toward sexual harassment of female employees and the chief financial officer's insider trading habits, david's sycophantic, shut up and color attitude at work has gotten him far up the corporate ladder and the owner's asses."