get off your own dick
it usally arrises in a situation, when a person belives they are so good at something e.g. football, games etc and they are basiclly up theirselves but only during the event.
(living room of a friends house after a night out)
steve: oh thats great play from that lad
troy: get off your own dick
nat/luke/chris/neil: hahahahaha
steve: now thats a good one
steve: oh thats great play from that lad
troy: get off your own dick
nat/luke/chris/neil: hahahahaha
steve: now thats a good one