Slanderous, racial epithet. A reference, by asians, to white people. The actual translation is mixed depending on who you talk to, but is either "White Devil" or "Pale Ghost".
Khan and Kevin as they are pointing to me and talking to Khan'sbaby daughter: "Ohh, Emily, you see the Bok Wai?!? Look at the giant Bok Wai!"
The statement "neg wai dim sum" refers to the chikyness of the chink language, intended origionally as a pun, the statement was expanded to be used as a greeting call of high school students.