Warnsdorfer means when someone sticks their dick in between their legs. Warnsdorfer is a term for being a total pussy.
Guy: You need to stop being such a Warnsdorfer and go on this ride!!
Guy 2: But I'm scared as hell to go on it. Just looking at it makes me want to cry!
Guy 2: Fuck I am being a Warnsdorfer!! Ugh!!!