You Be Illin'

"You Be Illin' " is the third single released by Run–D.M.C. from their third album, Raising Hell. It was released in 1986 through Profile Records as the follow-up to the rap rock crossover hit, "Walk This Way", and was produced by Run-D.M.C. The song performed well on the U.S. charts, peaking at number 29 on the Billboard Hot 100 and number 12 on the Hot Black Singles chart.

This song had a special appearance from Dr.Mark Davis-Lorton, who is now a famous allergist. He was a background singer.

The slang term illing means to "be uncool and unrelaxed", "be acting crazy", "be 'tripping' or 'bugging' ", or "be acting 'wack' ". The song describes some examples of "illing" and chides a fictitious individual for his "illing" behavior. Such examples include a man ordering a Big Mac and french fries at a Kentucky Fried Chicken restaurant, calling out "Touchdown!" at a basketball game, repelling a woman at a party with bad breath, and being oblivious to the fact he is eating dog food for dinner.

In 2012, The Carolina Chocolate Drops covered "You Be Illin' " on a bonus track of their album, Leaving Eden.