U
U: you. As in: U Wanka!!.
Ugly Fucker: pretty much everyone except the Chav speaking.
Upyerarse: Chavling response to a parent's request.
Unemployed: Chav occupation.
Unwashed: Chav state of grace.
Udders: Droppy breasts flopping onto the Chavette's beer belly.
Usual: As in "Pint of the usual, Luv." As opposed to the Unusual...