Preston Lacy

TMZ has obtained the mug shot of Preston Lacy -- aka the guy who farted into the fart mask in a "Jackass" movie -- after he was popped for weed last month. Lacy was busted in Oklahoma on December 14 -- after cops say Lacy was in possession of a controlled substance (weed) and drug paraphernalia…

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…