Slang for money. Most likely, you are only looking this word up because you heard it in the song "Why don't you get a job", by the Offspring.
My friend's got a girlfriend and hates that bitch... But she wants more dinero just to stay at home, well my friend, you gotta say I won't pay, I won't pay, no-no waaay. Na na- why don't you get a job?