Green Day Dictionary
- J.A.R. (Jason Andrew Relva)
- A friend of Green Day who passed away. JAR is also a song (International Superhits, track 8).
- Jackass
- Track 9 on Warning album.
- Jakob Danger
- Billie Joe's youngest son born on September 12 1998.
- James Washburn
- Billie Joe and Mike's childhood friend who lived in Rodeo, California.
- Jason Freese
- Plays the piano and saxophone on tour with Green Day
- Jason White
- Green Day fill in guitarist. He is also in The Influents.
- Jay Leno
- Green Day have trashed his green room.
- Jermac Styling Spritz
- The hair product Billie Joe uses to get his hair nice and crunchy.
- Jesse Micheals
- Jesse Micheals, ex-lead singer of Operation Ivy did the disc and cover art for 1,039 Smoothed Out Slappy Hours. Jesse Micheals and Operation Ivy were then thanked in Kerplunk.
- Jesus Of Suburbia
- The main character in American Idiot and is track 2 on American Idiot.
- Jinx
- Track 11 on Nimrod.
- Jocky Underwear
- The type of underwear Billie Joe wears.
- John Kiffmeyer
- Al Sobrante's real name.
- John Swett High School in Crockett, CA.
- Billie Joe and Mike's High School
- Joseph Marciano
- Billie Joe's eldest son who was born in March 1995.
- Jurassic Monkeys
- What the guys call joints to get past censors on Tv.