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when something is a sucky ass situation OR a retarded butt of a person
Boy: I have to go to work at 4:30 A.M. tomorrow
Girl: Wow. That's a bummerbutt!

OR

Awesome person to loser: Stop being such a bummerbutt!!
by AwesomeJandM June 30, 2011
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2
People on the beach who when you see from behind can ruin your day because there swimsuits and butts are the wrong size for each other.
I was having a good time relaxing at the beach until I saw a bummer butt and had to go home.
by Bullshitzer June 09, 2010
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