A sexually arousing dream that is either: not sufficient enough to cause a wet dream; or, is interrupted before a wet dream can take place. This normally results in embarrassing and uncomfortable "stiffness" throughout the day. Discomfort causes, in many cases, awkward strides while walking.
A gloomy, unfulfilled, attitude is normal for those who experience a dry dream.
Frank: Dude, are you okay?
Ben: (Sigh) Yeah I'm fine--
Frank: Then why are you limping?
Ben: (Sigh) It's embarrassing--I had a dry dream last night.
Frank: Oh man! That really sucks. You should probably go take care of that.
(Ben sighs and exits the room. . . poor Ben. . .)