UBNL, pronounced 'Ub-Nul' stands for 'Upper Body, no legs' and is a phenomenon seen in gyms across the world. An UBNL is a person (usually a man) who has lifted weights for a considerable amount of time and developed a very muscular upper body... but the retard (for whatever reason) has neglected to train his pegs and consequently has ended up with a set of girl legs that a big pink flamingo wouldn't want to be seen standing on.
Dave: "Look at that guy over there, what an UBNL".
Hot chick #1: "Wow, look at how big his chest is!"
Hot chick #2: "Yeah but have you seen his skinny legs though? What an UBNL.
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.