A device used to "crack" the seal on Nitrous cartridges for inhaling the N20 for a high. The cracker is commonly aluminum, brass or plastic and simply accepts a N20 cartridge (intended for dispensing whip-cream) and pierces the seal, allowing the gas to escape in a controlled fashion. A baloon is attached to the device to capture the gas and allow it to absorb enough heat to be inhaled safely.
Man don't try to suck it straight outta the cracker, your lipswill freeze to it.
The word "Cracker" was coined in the south by white slave owners. Slave owning whites refered to non slave owning, or poor whites as "crackers." Although it is considered in this day and age to be derogitory word for whites, if you know the history behind the word it is actually a form of flattery.
"You ignorant cracker, the word didn't come from the sound of a whip!"