A cross between two similar phonetic spellings of expressions: Whee, a high pitched glee; and Bwahaha, an evil and maniacal laugh. This combination results as a mischievious shout of joy. May be lengthened and/or have "hehe" added to the end of it for emphasis.
"Bweeee!"
"What are you up to this time?"
"Nooooothing."
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.