Charlie Sheen Fast Food Boss ... for Friend's Video

7/8/2011 3:30 AM PDT
If you've missed seeing Charlie Sheen act -- watching him play a fast food restaurant manager in a rap music video ... probably won't help.

Charlie played the role in "Steak and Mashed Potatoes" for free -- as a favor to his pals Simon Rex and Jack Splash -- who recorded the song as the rap duo Chain Swangaz2 Live Crew member Brother Marquis was also featured on the track and in the video.

We're told it was shot about a year ago when it was still smooth sailing on "Two and a Half Men" -- and ironically ... in the video Charlie plays the kinda hard-ass boss he accused Chuck Lorre of being.

The song is ... umm ... enjoy Charlie's performance.