A person usually white (But black also possible) who will change their behavior depending of the majority of the groups race and mannerisms because he feels insecure being himself.
Flingers can be compared to Wiggers
Slinger in a group of white people: Hello how are you?
White people: Were pretty good thank you we are talking about adele's new album
Slinger in a group of white people: Oh i love adele!
Slinger in a group of black people: yo wassup my nigga's whats poppin
Slinger in a group of black people: we be talkin about that other nig who released a new album 'n shit
Slinger in a group of black people: awww shit nigga we goin to hear that trash.