CHWDP or HWDP [xa vu dɛ pɛ] is a frequently used Polish acronym or initialism of the Polish phrase chuj w dupę policji, literally meaning "(put a) dick up the police's ass." This anti-authoritarian and anti-police slogan, often written on walls in Poland, is used as a vulgar form of provocation against the police and authorities.
The initialism was largely popularised by Polish hip hop music and Polish anarchists, where it is often used in lyrics and as graffiti. It is a specific expression of protest against the authorities, and against "the system" in general. It is more or less analogous to the English language expressions ACAB and “fuck the police”.
In Polish orthography, Ch is a digraph. However as chuj is pronounced the same as huj, the acronym HWDP is commonly seen.