This is taken from the movie Bill and Ted's Bogus journey. It refers to evil robot Ted and evil robot Bill seeing the photos of the princesess and Evil Ted getting a semi-erection and saying "I got a full-on robot chubby." Chubby being his penis before becoming turgid.
It has nothin to do with being turned on by robots. It is to do with ROBOTS being turned on!
Evilrobot Ted: I got a full on robot chubby.
Evil robot Bill: Excellent! (Probably!)
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.