We have a lot of slang words for money in general- doekoe, pecunia, poen, poet and loads more. Not specifically for euros. Some Dutch people say 'euri' though and that drives me MAD. I want to kill people who say that. Even worse is 'euri's' (basically, they try to conjugate it in Latin, but it's WRONG, and I'm a Latin teacher so yeah... annoys me).