That fucking silly bastard derick nobcheese illustrates perfectly the way the english language endures bastardisation with his shit explanation of said word:

Atomic Kitten have bastardisation
a song again!
Apple have bastardisation
microsoft, or tried to.

See? The silly fucking dumb cunt.

Bastardisation, the process of, is a corrupted copy of a given original.

To bastardise something.
To make something very uncool out of something that used to be cool.

A cover version of something, most commonly used as a musical term. Used to describe a 'song' as worse than the original or any predecessor.

derick nobcheese's entry is a perfect example of a bastardisation of a definition.

When something is poorly done in an "individual style"

Well, Bastardisation is a rterm given to the process of becomeing a bastard, or being a bastard, or even the term used to describe someone who has encountered the acts of a bastard.

A copy of something done in their own style, usually crapper.