A phrase used to easily getauthority and back up a statement in which you have no knowledge or understanding of. Can also be used as an escape route to quickly end or get out of a conversation(see example 2).
George: Don't place it near open flame, jackass.
Mike: Why?
George: Its gonna explode or something...Idk, I saw it on youtube.
Mike: Alright.
(to end/get out of a conversation)
Jim: It's not going to work, you have to fix the wires first.
Bob: Naa man, it's fine. I've done this before.
Jim: Are you sure?
Bob: Idk, I saw this on youtube though.
Jim: Oh okay.
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.
You didn't get any napkins with your takeout pork fried rice? Womp womp.