The best word on the whole planet needs it's own post.
The written form [+] is mainly seen in Hong Kong, for example, on graffiti. In Cantonese, it is used as a transitive verb meaning to copulate. In a manner similar to the English word fuck, it is also used to express dismay, disgrace, disapproval and so on. For example, someone may shout "diu nei!" ("fuck you!" or "fuck off!") at somebody when he or she finds that other person annoying.
"Diu lei loh moh!" ( "motherfucker") or "Diu lei loh mei" , a euphemism, is a highly offensive profanity in Cantonese when directed against a specific person instead of used as a general exclamation. In Cantonese, the meaning "I fuck your mother" is implied, as opposed to English, in which the phrase "motherfucker" is an imperative.
The form is absent in the Big-5 character set on computers. The Government of Hong Kong has extended Unicode and the Big-5 character set with the Hong Kong Supplementary Character Set (HKSCS), which includes Chinese characters only used in Cantonese, including the Five Great Profanities. The government explained that the reason for these characters being included is to allow for the Hong Kong Police to record criminal suspects' statements. Consequently, these characters are now also in Unicode.
In English, "damn" gives birth to its euphemism "darn"; similarly in Cantonese, especially Hong Kong Cantonese, diu has yiu and Tiu "siu" as its euphemisms.
