Disney rash

noun

Dis·​ney rash ˈdiz-nē- 

: exercise-induced vasculitis

Some [Disney theme park] visitors … experience a severe rash as a result of the heat and the physical activity. Colloquially known as the 'Disney rash,' it's more formally known as exercise-induced vasculitis. … If you're over 50 and walking around for hours on end in the heat, you're more likely to develop this condition.

—Lauren Weiler, The Cheat Sheet (online)