IS There A Plugin that when ever I write a word it will autio link it to ..
 

IS There A Plugin that when ever I write the word MILF it will automatically link it to a certian URL

and of course I wanna set up like 100 keywords like that

I saw a couple that may do the trick. I've never usd them but here are the links to them.

SEO Smart Links
&
aLinks (this one may be more of what you want)

alinks does what you want.

SEO Smart Links looks interesting but I'm not sure it will link outside of your own blog. I've never played with it.

that worked nice... thank you so much !!!

Do you know if alinks will work on rss fed posts or only on manually written posts?

aLinks works fine with RSS fed posts.