Top Definition
An Image board /b/rother of 4chan containing /i/. 4chan is jealous of it's 1337n355 and tries to ruin it by posting My Chemical Romance spam. Which is pointless and a waste of time.
4chan fag: LOL LOL LOL THE CAKE IS A LIE LOL LOL LOL
420chan dude: gtfo you retard...
by Obvious-Troll November 01, 2007
A place where druggies (mostly stoners) go to hang out and telling how high they are and asking for movies or help with getting high and people are at the cannabis section known as /weed/
stoner1: dude where can i find a place to help me how to get baked?

stoner2: go on 420chan man they can help you
by /weed/ February 24, 2009
A nickname given from the fanbase community of the anime "Isshuukan Friends" to a supporting character called Yamagishi Saki.

420 = smoking ganja.

And Yamagishi Saki kind of gives people that vibe. Therefore she was given the name 420chan
- Who is your favorite girl from "Isshuukan Friends"?
- Definitely 420chan. She is just awesome
by masongr November 25, 2014

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