Red October is the phrase used to describe a man who has poison ivy on his penis, testicles, and the general area.
Intercourse, hand-jobs, blow-jobs, etc. during the Red October period constitute in the spread of Red October. Side affects will be similar to "crabs" and can be fixed with steroids.
Most notably, intercourse will cause female Red October. Men are most likely to carry Red October as they are most likely to piss in wooded areas.