For when you don't want to do something, you say "Ah, just chuck it in the Fuck-It Bucket", such as work and school work. Also can be said by either party speaking when you DO want to do something. "Ah, chuck me in your Fuck-It Bucket, please." ;)
Man the homework we have is stupid, and the teacher never checks it. I'm chucking it into the Fuck-It Bucket".
Metaphorically, the place you put things that you don't really care about or want to deal with at the time. Also, something you would normally care about, but don't at the moment.
Man, I don't want do this right now. I'll just put it in the "fuck it bucket."
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.