A rather literal term referring to the action of deep diving in a common household underground storage tank containing fecal matter.
The use of this term is a great term to use to insult someone!
(see below)
Joey - Screw you Curtis, why don't you go for a septic tank deep dive you ass!
Curtis - I have chlamydia.
Milton - What do you do for work Henry?
Henry - I go for septic tank deep dives in peoples front yards!
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.