the act of putting pop rocks in a woman's vagina which pop due to the moisture; crackling refers to the popping pop rocks while clam is a common word for vagina
Her boyfriend gave her pop rocks with her birthday present because he wanted to try the crackling clam.
From Zergling. The weakest unit in the game Starcraft who has been fully upgraded with adrenal glands and metabolic boost. Becomes incredible fast moving and fast attacking, offsetting many weaknesses. Derived from the idea that the Zergling is "on crack".
In large enough numbers, a swarm of cracklings can easily destroy more powerful units such as Archons.
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.