Also known as a Quacking Guitar, a Farting Guitar is a somewhat silly side effect of Southern Rock. You see, In country music an Electric Guitar is distorted in such a way as to be played slowly, so it gives a smooth, calming effect. When Rock music is added Music has to be speed up, leading to a Fart like sound.
Have you heard The Outlaw's Green grass and high tides? Man, the End solo Has so much Farting Guitar in it it Becomes hilarious.