it means keep up with the car in front of you when the light turns green ("the wave")...if there's too big of a gap between cars, the light changes, leaving those poor souls behind to wait through another traffic cycle...so, in consideration for the chaps behind you, "Mind the Gap" between you and the car ahead of you when the light turns green!
If you don't 'mind the gap' between you and the car ahead, you'll tell the traffic light that no more cars are coming and the light will turn red, therefore causing the cars behind you to wait for another traffic light cycle.
by Snappyhead March 07, 2015
Used as a taunt/warning call prior to the action of sticking ones leg out with the aim of tripping a colleague up. Not necessarily to make him fall completely over but just for him or her to break stride rhythm and look like a "twat" in front of tidy snatches or rugby jocks they are trying to impress. Scream this at the top of your voice before the fatal trip.
*walking along when suddenly
"mind the ruddy gap!!!"
*person stumbles slightly and everyone mocks them/calls them a cunt
"mind the ruddy gap!!!"
*person stumbles slightly and everyone mocks them/calls them a cunt
by juliobug23 November 26, 2013
by Doingyourmuminator February 13, 2021