Examination of the male genitals, especially the penis to verify good hygiene and absence of disease. Years ago, VD (veneral disease) was spreading among army personnel so soldiers had to submit to these exams to insure that there were no unusual discharges from the penis and (especially uncircumsized) soldiers were clean. Since the rifle was nicknamed the long arm, the penis was named the short arm which is the origin of the name.
The sargewokeus up at 2 AM last night to perform short arm inspections.
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.