A man is having sex win a woman in the doggy style position. He fakes orgasm, pull his cock out of the woman's body and spits on her back, simulating ejaculation.
She then turns around thinking it's all over, and at that precise moment, the man comes on her face, in the region between the nose and the mouth, creating a mustache, i.e. the Pedro.
"Last night, I did the Pedro to some random girl I met at a bar."