When you sell an item to an individual and decide to not sell that item to that individual because a better offer came along, therefore renigging on the previous offer. To go back on a promise, undertaking, or contract.
I was not planing on renigging, but later that same day when I was offered an extra $100 plus a bag of weed, I'd be an idiot not to take the better deal?
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.