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1.
406
n. A term derived from the movie "Zombieland".

It is used to refer to an attractive female. Usually, it must be a neighbor of yours for it to even make sense since you are referencing the movie.
Guy 1: "I have a new neighbor that just moved in."
Guy 2: "And you're telling me this because?"
Guy 1: "Dude, she's a 406!"
Guy 2: "Have you met her? Can I meet her? Let's kick it at your place right now!"
by Certified Smartass November 24, 2010
 
2.
406
The area code for the whole state of Montana
"Representin' 406 we mow bitches"
by Da-Money July 16, 2008
 
3.
406
A discrete way to refer to a hot female, quoted from the movie Zombieland about Amber Heard.
Dude, look at the 406 at that table! I wish she would try eating me!!!
by j4883rwocky November 13, 2010