To make a bastard doesn't necessarily have to refer to people. Giving a legitimate word a new meaning could be bastardising the word. Basically, it's butchering the English language. See orphaned. If you have an idea, and someone takes the idea, changes it around and gives it new meaning, that's bastardising. If you design a newsletter, for instance, and someone else takes over and keeps part of your design but applies elements that don't match up with yours, that's bastardising. You get the drift.
Henry, how do you like the newsletter now that Sue's been doing it for a year?

I'd like it better if she hadn't bastardised my design.

Well, how do you like urbandictionary.com?

Half the people putting stuff up there just bastardise the language.

by Glenwood October 1, 2006
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derick nobcheese's entry is a perfect example of a bastardisation of a definition.
It helps to use nouns properly in a sentence, preferably as nouns and not as verbs.
by Militia July 27, 2004
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When something is poorly done in an "individual style"
1337 is the latests bastardisation of the english language
by Gumba Gumba February 21, 2004
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When a person or animal excreets.
"In a chav's household you may even catch sight of a mangy cat bastardising under the dining room table!"
by Leanne March 16, 2005
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To Utterely and Irreversably fuck it up in the way only a child born out of wedlock could ever do.
I was having an intimate moment with the maid when Bob the Bastard entered with my wife and totally bastardised my night.
by ///Lee July 11, 2008
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Being a bastared.
That dude is really bastardised.
by Benjamino October 8, 2003
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it simply means to make someone a bastard.
"why did I have to bastardise our new son?!?!?!"
by Dannyisjesus December 6, 2005
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