colloquial language - What is the usage of 「つー」, what does it mean and what other ways are there to express the same thing ?

I've seen this many times in mangas, here's one example:

アンタなんかが手にしていいお金じゃないっつーの！！！

Context: A girl catches a thief that stole today's takings at the shop she's working at.

Thank you! 手伝ってくれてありがとう。

Answer

It's a shortening of って言うの!　or って言っているの! and shows some irritation on the part of the speaker. "What I'm telling you is . . .!" There's some good explanations here: http://oshiete.goo.ne.jp/qa/1847367.html