From ibikeu Wiki

DIY is an acronym for "do it yourself". DIY has proven popular in underground culture, especially withing the past few years. So much, in fact, that DIY has become a noun in it's own right.

Movement

Ethos

If it can be made by hand, make it by hand.

Projects

The DIY mentality can be applied to almost any situation. Home decoration, clothing, and bike maintenance or fixed-gear converstions are examples of where DIY thrives.