An Arkansas Beanstalk is when a man has numerous ticks on the shaft of his penis so that when it gets erect and the ticks swell with blood it looks like a beanstalk. This can provide his partner with unbelievable pleasure as the ticks provide pressure points similar to ribs on a condom.
Man, last summer after the corn harvest I had an Arkansas beanstalk that took three days for the old lady to work out. I gotta tell you though, she cant wait till next year's harvest.