I remember being like 10 years old out at the waterslides in Manteca, CA and these 2 older white boys were pointing and smiling at me yelling "Look! It's a FOB! HAHAHAHA"

I flipped em off and yelled, "Fuck you, bitch!" They STFU and fixed their faces real quick.

Many fights and beefs betweens groups/gangs of American-borns and foreign-borns growing up in the 80's and early 90's stemmed from usage/misuse of this word.