wanna = want to sometimes, we speak quickly, and it really sounds like "wanna" better to learn "want to" first also going to , we say gonna we speak like this, but to write like that, is very informal. On Italki, i would recommend not writing that way, but you can do what you want, of course.

Like others have said, people say 'wanna' instead of 'want to' colloquially. I wouldn't call it slang though. It's just a result of speaking quickly. Say 'want to' and 'wanna' right now. You'll see that 'wanna' is much quicker to say. 'Wanna' is never written, except when quoting someone that said it. People say it because we're lazy (me included). Never write 'wanna'. It won't make your English look more colloquial when writing, it'll just look childish.

"wanna" is slang for "want to".

Maybe instead of wnat - what? Wanna - want to

"wanna" --- slang