Morning Icicle is when a male wakes up with an unnaturally cold boner. Usually found in the winter or when sleeping with your meat in an ice bucket. 99% of all cases wake up screaming due to the huge pain of a frozen, erect, penis.
Joe: Hey, have you seen Steve?
Rob: yeah, he woke up about an hour ago screaming.
Joe: Oh! Did he have another Morning Icicle?
Rob: Yeah, I don't know why we go camping with him.