The Nalgina is the fleshy skin flap between the female vagina and in Spanish, the word for little buttox, "nalgita." It is also commonly referred to as the "perenium," "grundle," or the "gooch," located similarly on males between the penis and the chocolate eye.
The role self-assigned by/to the person in the passenger or back seat of a car who insists on giving unwanted and endless streams of useless directions, much to the annoyance of the driver.
"Look, I'm driving this car. I know where I'm going and yes, I can see that stop light. I don't need a Naginator."
1. a halberd-like weapon consisting of a long pole fitted with a one- to two-foot-long metal blade with a slightly curved end somewhat similar to the end of a scythe.