a phrase often used by someone who would rather emphatically reject the possibility of a proposed scenario than offer a self-reflective and genuine response.
bc "no not never" is almost always a knee-jerk or automatic denial, those on the receiving end of the term usually suspect that the protagonist has deep-rooted issues and is, therefore, projecting the issue off of his/herself rather than reflecting on what caused the aversion to self-reflection in the first place.
MANNY: cord, you gay a.f.
CORD: i mean, i don't think i am but i guess if i lived forever maybe i would get bored and try but for now i've only been into ladies. do you think you're gay, ma--?
MANNY: no not never. fuck you punches cord in the dick
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.