greets to the final bosses of internet: cromlech, aush0k, dshocker, atomiku, Romford trev, piddle, rolo, baz.

From Encyclopedia Dramatica

Basically anything that sucks... also, stuff that makes indie fucktards cry.

Mainstream can also be anything that the man tells you to buy, eat, fuck or all of the above.

[edit] Mainstream shit

• Music: Anything on the radio

• Movies: Anything that isn't Napoleon Dynamite or Garden State

• Porn: Anything without horses, midgets, or pee

• Television: Anything on Adult Swim

• Blogs: MySpace and YouTube

• History: Anything about the Vietnam war or WWII

• Music: Green Day

• Television: MTV

• Politics: Republican

• Internet: Encyclopedia Dramatica, We Are The Mainstream, Slashdot and almost any meme you come across on 4chan