When on Jackass, Lacy is most often featured with Jason Acuña (Wee-Man) and their most common skit involves Lacy chasing after "Wee-Man" down public streets in nothing more than their briefs and white T-shirts. Lacy has contributed many of the ideas that later became Jackass skits and stunts. His most celebrated scene is from Jackass Number Two, entitled 'The Fart Mask.' In the scene, fellow cast member Steve-O placed a clear globe over his head attached to a hose and funnel, in which Lacy was to pull down his pants and expel gas. Lacy took it an extra step by defecating in the funnel, which caused Steve-O to vomit. Lacy shares a writing credit for National Lampoon's TV: The Movie.
He starred alongside Chris Kattan in the film Christmas in Wonderland. He appeared in Jackass 3D, which was released October 15, 2010.
On December 14th, 2010, Lacy was arrested in Oklahoma for possession of a controlled substance, which was marijuana, and drug paraphernalia and was charged with two misdemeanors[4]. Lacy could face up to two years in prison if convicted.