Top definition
1. A person who thinks they know EVERYTHING about Green Day but they honestly don't

2. People who spell Billie Joe Armstong's name 'Billy' and think they are 100% correct while real Green Day fans know its B-i-l-l-i-e NOT B-i-l-l-y
Green Day Know-it-All: "omg Green Day is awesome! i know like everythinggggg about them!"

real GD fans: "really then when is Billie's b-day?"

know-it-all: "feb. 17"

real GD fan: "yea.......... well if u really know EVERYTHINGGG about them, when was the band assembled?"

know-it-all: "......uh......ummm......2003?"

real GD fans: ".......oh my god....... -___-"

know-it-all: "(texting his/her friend): omg!!! did u c Billy Joe Armstrong last night on that award show?!?!?!"

real GD fan (relpying): "yea he looked sooo hot but ITS B-I-L-L-I-E! BILLIE! NOT B-I-L-L-Y!!!!!
by Green Day Luva 217 <3 November 22, 2011
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