Someone who sits on a public toilet seat without creating a “nest” out of toilet paper to protect themselves from germs. Bare Bummers reject nesting on toilets and prefer to expose themselves to germs.
That guy is a bare bummer, when he uses a public washroom he doesn’t nest!
Lyric from Chappell Roan's "Super Graphic Ultra Modern Girl". A man who is mediocre at best and brings you down at worst. Overall ruins your day.
"Girl, my ex is such a hyper mega bummer boy."
"I don't need hyper mega bummer boys in my life. Girls are better anyway!"