Fan Nickname: As the game doesn't give you the names of normal enemies until the credits, players tend to give them these. Anyone who has watched Northernlion enough tends to use "human popcorn", "silkworms" and "zambies", in place of their real names (Mulligan/Host, Charger/Spitter, Knight).
An even more common one is "Blue Baby" for the unwieldy ???. For the True Final Boss as well as the character.