This refers to the baseball euphemism for sex. 1st= kissing, 2nd= touching boobs, 3rd= touching genitals, and a home run would be sex.
A pop fly=oral sex. A pop fly can be hit at any time and does not always fall in line with "bases," as is the case with oral sex; it can come at any time, usually after 2nd or 3rd. It can also occur after a home run is scored.
Wiping your ass, dunking the paper in the toilet, then throwing it on the ceiling. The follow up to the upper decker. Also known as an in the park home run.
Ken left an upper decker at Mikes house, then hit an infield pop fly.