natty /ˈnæti/adjective 4noun 2forms 5 adjective4 •(informal) Smart and fashionable.“They’d look very natty, arm-in-crook together, and their best clothes on, whether or no, if he’s at all the well-favoured fellow he used to be.” — 1878 •(slang) Natural, as opposed to steroid enhanced.natty gains •(slang) Knotty.natty dreadlocks •(slang) National. noun2 •(slang) A national championship.I hope my favorite team makes it to the natty this season. •(slang) Someone whose muscle gains are natural and not aided by the use of steroids. formsnatties · more natty · nattier · most natty · nattiest