When a male dog's penis unsheathes, it resembles the action of someone twisting red lipstick, also because a dog's penis is red.
Dude #1: Your dog totally unsheathed on me when I pet him!
Dude #2: Well, he wanted to give you his red lipstick!
When a man's penis, whether hard or not, is pointing upwards in his pants against his stomach. Usually happens when laying down, but is most uncomfortable standing up.
*whispers to Dalton sitting next to him in class* Dude, I'm up so up north right now, but I don't want anyone to see me adjust myself.