Young Buck

Fails To Pee On Schedule

Urine Trouble Now!

5/26/2014 12:25 AM PDT BY TMZ STAFF
EXCLUSIVE
0520_young-buck

Young Buck
may have a little performance anxiety ... he's missed two court-ordered urine tests and has now been warned ... third time will NOT be a charm.

Buck -- who's on probation for gun possession --  has had a steady stream of drug tests since November when he got out of the slammer -- all with negative results.  But he bailed on the 2 most recent tests.

Buck admitted in court docs he screwed up ... but his probation officer was pissed off and threatened to throw him in jail.

Gee whiz.