"k", new What does 'Keen as mustard' mean in Australia? Australian slang 'Keen as mustard' meaning? New Aussie slang in your inbox.You beauty. Leave this field empty if you're human: Fair dinkum words and phrases, sent once a week. 'Keen as mustard' meaning One Definition Outback Bazza To be very keen on something; to be particularly interested in, or looking forward to something. Example: I hear the meat pie eating competition is on this weekend, and Trac is going to take part. Mate I am keen as mustard to go watch! Add a Definition Cancel reply Save my name, email, and website in this browser for the next time I comment. Notify me by email when the comment gets approved. Example *
To be very keen on something; to be particularly interested in, or looking forward to something.