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Michael Rapaport's had it up to here politely trying to ask the youth -- and their parents -- to stay indoors ... he's demanding it now, and with some cuss words to spare.

The actor and sports fanatic hopped online Tuesday with a VERY blunt PSA ... except, it ain't anywhere near as calm and collected as some of the others you've seen from your fave celebs over the past few days. Mike's getting nasty, and maybe rightly so.

"GET YOUR F****ING KIDS INSIDE!" -- it's a message to the parents of teens and young adults (probably dumb college kids, mostly) who either still live at home or rely on their parents for dough. In any case, if parents have some authority -- MR wants them to flex it to the fullest extent so their children stop infecting everyone else.

Check out the full 2-and-a-half minute message yourself, 'cause we really can't do it justice. Mike -- never one who's at a loss of words -- finds just the right ones to describe the dummies who disregard social distancing and quarantining ... and insist on partying.

Play video content 3/19/20 CNN

It's kinda crazy -- he says he was asked by the powers that be to do a kosher PSA like most everyone else has been doing ... but he said screw that, and did one that'll resonate and accurately reflect society's outrage. BTW, his message applies to more than the "s**t-stained" kids he's talking to -- anyone screwing around with this outbreak needs to listen up.