409 is the area code which comprises most of Galveston County in Texas. (The Northern part of Galveston county usually has a 281 area code.) 409 also includes the Beaumont area which is lesser known.

Houston people usually think of 409 as the area code for the Galveston area not the Beaumont area. 409 is more widely known for the Galveston area.

ghettoboy: Here is my number 409-***-****
Houston-emogirl: 409. So you must live near Galveston, right?
by crysci February 12, 2007
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any kind of SUPER slut/whore/skank
Yo homeslice, your little wifey pulled a 409 last night when we was up in da crib and she was all over the c-unit...
by B-UnIT! October 31, 2003
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That absolute crappiest road in the whole universe. Just make sure you ride in a suburban and not your friend mom's car or you may die.
Lets take Jennies car down 409 avenue! 409! 409!
by postmaster69 January 1, 2015
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A party house located in Albany, NY on Hudson ave. in between Quail and South Lake. The house is approximately 2000 sq feet with three floors and a basement. Currently there are eight people living in the house. Parties typically take place during the weekend and have 4-5 kegs of Keystone Light and Jungle Juice comprised of water, beer, kool-aid, and about 3-4 liters of Crystal Palace vodka. Parties typically begin in the basement then expand to the upper floors as the amount of people increases. One or two house members are responsible for selling cups which are priced at $5. There is no cover at 409 Hudson ave. but those who do not pay for a cup are usually asked to drink there own alcohol. The house has been praised for having an extremely balanced Girl:Guy ratio although the balance has shifted in either direction in past parties. The typical drinking game setup is one to two pong tables in the basement and flip cup tables upstairs and outside (depending on the weather). 409 Hudson's most noted parties have been: "409 Halloween Party", "Andrew and Zac's 20th Birthday", "Kegs and Eggs Pregame at 409", and "409 Stoplight Party".
UAlbany Student #1: Yo I went to this party at 409 last night and got total obliterated. This kid threw up and fell down a flight of stairs
UAlbany Student #2: Yeah they call him Pyatt, that's nothing though I heard later he went out to get pizza and got tazzed by a cop!
UAlbany Student #1: Only at 409 Hudson..
by Ascat December 3, 2009
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A song by Green Day. It's about how boring school is, but it's also rumoured that Billie Joe once put 409 in his teachers coffee. 409 In Your Coffeemaker can you find on the album 1039 Smoothed Out Slappy Hours
I listened to 409 In Your Coffeemaker
by Jaded409 May 26, 2006
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I can’t wait to date Stefani, I heard she will let you take her down County Road 409.
by BallsMahoney75 February 28, 2019
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A Green Day song, but also a phrase used to describe someone who's totally out of it.Foggy-headed, dazed, or acting generally high though not under the influence of drugs. Can also be used to describe someone with a bad cold who is only awake because they've ODed on Nightquil
"Man, that movie was awesome! What do you want to do now?"
"Uuughh? Yeah,that sounds good..."
"Dude, you're totally 409 In Your Coffeemaker today."
by plataypusIhateyou October 12, 2005
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