As a condition of his probation on weapons charges, Young Buck needs to submit to a urine test every couple weeks.

Back in May, his probation officer caught him funneling a yellow substances that was not his own pee into his piss cup.

Buck tried to claimhe was fearful that he had inhaled illicit second hand smoke. But when that excuse was laughed away, he admitted he had recently been hanging out with Snoop Dogg, and couldn't resist the urge of inhaling some weed with Mr. Ganja himself.

That decision may cost Buck big. Since it's a felony to falisify a drug test, the G-Unit solider is now facing five years in prison.

Buck severed his 18 month sentence for the weapons charges in 2012 and 2013.