The act of spraying your goo all over the paper bag covering an ugly chicks head during sexual relations. Once the jizz has softened the bags wrinkly texture, it is not uncommon to press the bag against the girls face until drying of the manglaze has commenced, thus creating a paper maché of that ugly bitch.
Harv: How did the sex with that butterface go last night?
Jon: That showty was hit, so instead of takin' the bag off her face I just paper maché'd her ass.
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