1. unwashed, unshaven, skid, sloppy and not giving a damn what anyone thinks. From the root word bum, aka hobo. Likely because they smelled like bum.
2. messy, casual, relaxed, ghetto chill in a stylin way and not giving a damn what anyone thinks.
3. wabi-sabi
1. Man, that guy is lookin way bummy today.
2. That is such a great bummy look for you.
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