The Rap Mechanic refers to hip-hop artist Pete Wurthy, aka "The Rap Mechanic". He often totes a larger than life pipe wrench that was passed down to him from his grandfather. The wrench tends to be the largest wrench most non-industrial mechanics have ever seen, especially on a stage during a performance. The Rap Mechanic is also known to spray his front row audiences with water in various forms.
Concert guy1: Did you see the Rap Mechanic? He totally just dowsed those people down front!
Concert guy2: I know! How come we can't ever get front row seats?!