Bummer is a racial slur, in
Vietnamese street talk for an African American, similar to the N-Word in American language. It is a slur meant to criticize, and slander
people who aren't of Vietnamese heritage, mainly
people of darker skinned ethnicity.
"
Yo Nina! Nguyen just called me a Bummer!"
"A Bummer?"
"Yeah
man, my boy told me it's like calling me a n***er!"
"HELL NO!"