Top Definition
The opposite of 'mainstream'. Applies to music (modern and older), books, hobbies, movies, etc.

The 'Is It Mainstream Music?' Test: Does this song/band play on more than three radio stations? Yes- Most likely main. No- Most likely sub.
Miley Cyrus and Jay-Z? Mainstream. Freezepop? Substream.
by Unexist May 16, 2010

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt