Icydick is when you get Icy Hot, Bio Freeze, Vix Vapor rub, or similar product on your balls or dick and now you have Icydick. That shit hurts. This could have been accidental because your dick itched while some of this stuff was on your hand, or because you're weird and put it there. Whatever.
Dude i put vix vapor rub on my chest last night and itched my crotch, next thing i know i got Icydick!