Farting Guy in 'Jackass' -- Busted for Weed

1/1/2011 5:40 AM PST

Farting Guy in 'Jackass 3D' -- Preston Lacy Arrested for Weed

Preston Lacy -- the guy who farted into the fart mask in "Jackass 3D" -- was arrested earlier this month after cops discovered something else with potent fumes ... marijuana.

TMZ has learned ... Lacy was busted in Oklahoma on December 14 -- after cops say Lacy was in possession of a controlled substance (weed) and drug paraphernalia (rolling papers).

Lacy was charged with two misdemeanors -- and if convicted, he could spend up to two years in prison and face $2,000 in fines.

Attempts to reach Preston were unsuccessful.