origin: More Fire Crew, who describe themselves as 'one of the UK's leading garage music crews'. I must add here that 'leading', and garage being defined as 'music', are two points of personal contention.
At present MFC are engaged in a fierce and occasionally violent rivalry with fellow garage 'musicians' the 'So Solid Crew'. This leads on to the question often asked on the 'street', or in the 'hood', 'Are you More Fire or So Solid?'. The respondent's answer to said question can result in either:
a) a sound thrashing (if they nominate the rival crew)
b) cries of 'respect' or 'safe', if the interrogators share the same view
Thus to be 'locked on' is to be in touch with a situation, to understand and appreciate its significance. To 'stay locked on', is to remain up to date.
It is often used as a replacement for 'see you later' or 'goodbye'at the end of a conversation.
2. Shit, that guy's staying properly locked on.
3. More Fire Crew say 'stay locked on', and come to our under-18s GCSE results day 'special' disco. Selecta!
4. Roger that, I've got him covered Maverick, i'm staying locked on...