The white person version for the n word. Historically, it was used by non-whites as a derogatory term, bringing back the various hardships that whites have experienced. Recently it has been reappropriated to be used affectionately among caucasians but still considered very offensive outside the white community.
When Dona Maria heard that Eagle Rock was being gentrified, she murmured "I can't handle all these chumpasauruses taking over!"
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.