SLANGY VETO is a term used to describe the act of vetoing something in an informal manner. The two crossword solutions IXNAY and NIX are both slang terms for vetoing something. IXNAY is a five-letter word derived from the phrase 'say NIX' which is a colloquial way of saying 'say no'. NIX is a three-letter word derived from the German word 'nichts' which means 'NOTHING'. Both words are used to express disapproval or refusal.