Slang frequently used by 'chavs' ostensibly to mean homosexual. Based on the word 'batty' with the same meaning. However the word usually does not actually refer to the person in question actually being gay, more that they are annoying.
"Hey Kev ya piss midget, you facked my bird Shazza. You must be batters innit."
Nickname for the political party New Labour amongst some left-wingers, with the blue referring to what they percieve to be the Tory Thatcherite policies that they have adopted/stolen from the right, whilst totally abandoning any pretence of being a workers party.