Originates from the football player 'Roy Keane'. Used to descibe someone who tries too hard or is too 'keen' to impress, or over excited about something. This has developed to being a 'roy'. Too keen - Roy Keane - roy.
'He was a total roy', 'I've met a right roy', 'Is your name roy?'
Or b'd. One is so not bothered about something that they cant even be bothered to say bothered so they just say beed. For the ultimate not being bothered just use make the beed hand sign as a 'b'