Simply put, it's a shortened version of FFFFFFFUUUUUUUUUUUU. 7
F's and
12 U's. Any more than that and you're doing it
wrong.
Waiter: What would you like to drink
sir?
You: I'll have a
coke, my good
man. Shaken, not stirred.
Waiter: Dreadfully sorry my lord, we only have Pepsi.
You: ...
You: .....
You: F7U12 D:<