The hillbilly

One day a hillbilly is driving down the road and sees two hitch
hikers. He's a fairly nice fellow and decides to pick them up.
He can instantly tell that they are a little strange but doesn't
really worry about it. They're driving down the road a little
when they hit a bump and one of the hitch hikers lets out an
airy fart. The hillbilly looks over and wonders what is wrong
with that guy. They drive down the road a little more when they
hit another bump and the other hitch hiker lets out and airy
fart. Now the hillbilly wants to laugh because there gas is
just pitiful. He decides to show them what real country gas is
like. So he sits there and tries to work up alot of gas when he
hits a bump and lets out a giant, deafening fart. Now he is
impressed but the hitch hikers are wondering whats wrong. They
start giving each other odd looks when one turns to the other
and exclaims "VIRGIN"