Adjective. The state of being completely oblivious to your surroundings because you are too engrossed in using your iPhone, iPad, or other mobile device; Often used to refer to someone texting, Facebooking, etc. while walking.
The most incredible comeback to any argument. Telling your opponent to spell icup will instantly disable all of their bodily functions and render them udderly defeated. It is the key to the understanding of the universe and can destroy anything that dares to spell it.
When one asks another verbal mammal to spell iCup, they are attempting to humiliate said animal by getting them to speak the words: "I see you pee", to which
Kid: "Spell "icup".
Other kid: "What? NO!"
Another kid: "I C U P, there."
Kid and Other kid: "Ha ha ha ha ha!!"
Another kid: "So?"
Kid: "It stands for I SEE YOU PEE!"
Another kid: "Yuck!"