It means Fuck The Attitude Out Of You, it is used in the title of the song “FTAOOY” by Playful Devotion.
It means that someone is holding a bratty attitude / disposition, and you decide to put them back in their place through rough sex / an equally roughsexual situation, meant as a “punishment”.
(Over text; saying the abbreviation IRL would sound weird.)
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.
A lighthearted reaction upon receiving disappointing news of some sort. Usually something that isn't a particularly a big deal, esp. when it primarily affects someone else - sort of a mild schadenfreude. Sometimes doubled or tripled, and possibly said in a sing-songy voice for added comedic effect to imitate a muted trumpet, which is how the meme originated.