This act is similiar to the well known Dirty Sanchez in which after having anal intercourse with a woman, you withdraw a soiled erect penis and trace a stinky moustache onto her upper lip.
This act places the Hindu spin on it, whereas the freshly soiled penis, is withdrawn from the backdoor and poked at the woman's foreheaed several times, leaving the spotted stain of the Dirty Allah.
After Mike had enjoyed several moments of Wendy's backdoor, he unexpectedly removed his penis, walked around in front of her and kneeled down. Holding her head gently in his hands, he poked her several times with his penis on her forehead. The sensation of his penis on her forehead, coupled with the smell told her she'd just been given the Dirty Allah