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1.
when your reciving a blow job and then taking a dump on the girls chest, an then when your about to cum you pull out and try to make zig zags on the topp of the shit.

Then grab her by the ankels and lift her up so the shit rolls down into her face from her chest, and that breif moment she grins and says oh my god thats gross.
i met this chick at the bar and i gave her a smiling hotdog.