To have someone (a male), orgasm (aka: cum) on your face, in a similar manner to a facial. Gluing is not necessarily limited to the face, this is merely the most common context in which the expression has been found.
Much to Mary's chagrin, her boyfriendpulled out at the very end of a blowjob (as if suggesting her was going to tea bag her), and glued her face instead.
When your girl falls asleep before sex you are forced to masturbate. Just before the finish you walk over to her sweet sleeping face and shoot it all over her closed eyes thinking to yourself 'yeah that's right...fall asleep again'. Your girl wakes up but cannot open her eyes.