YOUNG BUCK I Just Got Evicted!

Young Buck is in SERIOUS trouble -- the rapper has been evicted from his Tennessee mansion ... AND the I.R.S is still on his ass for more than $300k in unpaid taxes. 

ImYourMedia.com has learned ... the former G-Unit rapper was ordered to vacate his 5,000 square foot home by May 16th. 

The details surrounding the eviction are unclear -- however, court docs show the judge in Buck's  bankruptcy case signed off on the sale of the house ... and ordered that the proceeds go towards paying off his massive $333,975.69 debt to Uncle Sam. 

Sources tell us ... the rapper -- who bought the house in 2004 -- was spotted earlier this week carrying boxes and removing all of his stuff from the residence.

It's just the latest in a sad series of problems for the rapper ... who filed for bankruptcy back in 2010 ... and was SHOT AT 11 TIMES back in March. 

We reached out to Buck for comment -- so far, no response.