1. The Drink costs less than 50 cents.
2. The Drink is not in a bottle
The most common use of this word is used for tropical fantasy, which is sold at 50 cents at most stores.
Friend 2- You know what you could do with 1.50?
Friend 1- What?
Friend 2- You could buy 3 bummys.
Friend 1- ...
a word used to notify other people of how unlucky/unaccommodating the events surrounding you or another really are. usually used with the adverb "so" with emphasis placed on the 's' and a tonal upstep with the final syllable of the phrase.
shorya: nothin man, just had a math test
felix: o shit how wus it
shorya: sooooo bummy
2. messy, casual, relaxed, ghetto chill in a stylin way and not giving a damn what anyone thinks.
2. That is such a great bummy look for you.
"I know, they really know how to kill a party"