"vertical" bottom line 

Da final profit/loss amount produced by showing your butt-crack in public.

Depending on da general locale, how good-looking your behind is, whether you're male or female, da general conservativeness of da local culture, how many singles there are in da populace, etc., da "vertical" bottom line experienced in a particular area can vary wildly.

"vertical" bottom line by QuacksO February 21, 2023