Re: Stuck hemipene, I think.
Good news, I took him to the vet and turns out it was just a sperm plug. The vet soked him in luke warm water for a few minutes and it come right out. He did inform me in case of a prolapsed hemipene, you sould soak him in cool sugar water bath. The cool water and sugar will help to soften the hemipene then you message the base of the tail to help it retract.
Re: Stuck hemipene, I think.
This exact same thing happened to one of my male Leopard Geckos, the vet called it a Smegma plug. You'll want to keep an eye on that side of your beardie, after the plug was removed from my leo he ended up having a prolapsed hemi-pene and it ended up being amputated (not by the vet...he did it himself = _ =).