2. A term used between two people of utmost comfort to get the others attention.
3.A secret language created by a duo to confuse others and therefore make those around them just that much crazier.
4. An orgasmic word shouted during climax
"MOOFI WHAT THE HELL?!"
"Moo Moo Moofi?"
Essentially, "moofi" is anything and everything you can imagine. It's most commonly used in exclamation. Phrases like "I'll tell Moofi..." and "that's so moofi" are just fun to say. It doesn't really mean anything in particular, which is why it's so useful.
Person 2: um... I'll tell Moofi about you and that one girl...
Person 1: MOOFI.