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Silento allegedly got loud and threatened people with a hatchet while trying to find his girlfriend ... and now he's facing felony charges.

The "Watch Me (Whip/Nae Nae)" rapper was arrested last weekend after a bizarre incident in which law enforcement sources tell us ... he walked into a house with a hatchet in hand as he looked for his GF.

We're told someone in the house screamed for help and others took him down and disarmed him. Our sources say shortly afterward, Silento's friend arrived and told him it was the wrong house ... and they fled as cops were called.