Semantic satiation is a psychological phenomenon where repeating a word or phrase many times causes it to temporarily lose its meaning, making it sound like a meaningless collection of sounds. This occurs because repeated activation of a neural pathway to a word's meaning can cause temporary fatigue or inhibition, leading the brain to re-regulate its focus and temporarily cease to process the word's meaning.
I kept repeating the word 'crowded' over and over for a minute, and by the end, it just sounded like a weird noise—total semantic satiation!
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.