Learn how to say Bummer correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word bummer:
1 (a bummer) a disappointing or unpleasant situation or experience:
the team’s relegation is a real bummer
2North American a loafer or vagrant:
baby doesn’t have to be a travel bummer
mid 19th century: perhaps from German Bummler, from bummeln ‘stroll, loaf about’