Other: The extream knowledge of weapons, how they work, what rounds they use, how to use them, etc
Dave: w00t check out that Heckler and Koch Usp.45 acp AWSOME
Bob: Holy crap, how did you know that?
Dave: nomenclature man...
Dave!: Strangled by his own penis.
Zak: Yep that's nomenclature for you.
*Best when used in public or amongst educated friends when in an argument with a buddy.
Friend3: I don't want to.
Friend2: Yemen, let's go!
Friend3: Nomenclature... I'm tired.