Other forms: snazzier; snazziest; snazzily
If your grandma comments on your snazzy outfit, she means that it looks fancy and trend. In other words, it's a compliment.
Snazzy is an informal, slightly old-fashioned word for stylish, fashionable things, especially clothing. Your snazzy new red patent leather boots might look great but not keep your feet warm, and your snazzy silk dress is probably too dressy for a regular school day. Snazzy is an American English invention dating from 1932. Experts guess that it either comes from the Irish snas, "good appearance," or a combination of snappy and jazz.