The result of having sex or masturbating vigorously and going to sleep without washing up. Upon waking up, genitals may be firmly stuck to thighs, other genitals, or simply glued shut, depending on gender and sleeping position. The only cure is a hot shower, and the only prevention is a handy towel.
I woke up with morning glue after banging Sally last night. I had to peel my junk off my thigh just to walk to the shower.