A fork of Rural Dictionary
rh essentially can mean many things.. In this definition, RH means Race Header, an exhaust manifold and is illegal to use on US Public Highways and Roads because of the elimination of a Catalytic Converter, which causes green house gas emissions to enter the atmosphere and cause Global Warming. ..But who cares? :)
Jeremy has a RH on his 4 cylinder vtak.
Road Head, a guy recieving head while driving. Most likely increases your risk of car accidents.
Guy: "Hey I think you dropped something near my feet" Guy: "Just kidding. Now gimme RH bitch"