Top Definition
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
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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