Man rash is the condition that results from wearing certain types of boxers (especially flannel) on a hot day. The sweat soaked boxers will begin to cause a form of chafing very similar to diaper rash. This condition is more common in big men, as they tend to sweat more and their thighs rub together more. A man suffering from this condition can often be seen walking in a bow-legged manner.

Man Rash is also believed to be the biggest driving force in sales of baby powder to men.

A casual invitation / threat used by an individual that is not afraid of fucking someone up.