1. Type of bomb, characterized by a loud, shrill screaming sound.
2. A type of firework, also characterized by a loud, shrill screaming sound.
3. A term used to convey how frightened you are. Commonly used in place of, or along with:
Heebie Jeebies
Booboo Jeebies
Quiver Shivers
Hoohaa Quivers
Shaky Shivers
and Scooby shivers (named for the shaking that the cartoon character Scooby Doo is prone to do when frightened)
Also, used in place of shorter terms, such as:
Creeps
Shivers
or shakes
"To get rid of the enemy, screaming meemies were used to destroy the area."
"The screaming meemies were so loud that they made my ears ring."
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.