A Christ Drive occurs when while driving on a summer's evening in say, Brighton, a passenger shouts 'Christ', while passing any number of extremely attractive girls walking by. Thus it's a Christ Drive.
Three Guys are cruising a busy seaside town on a hot Saturday night.
Dave ' Christ, look at that' (while the car is passing by a very attractive girl who is walking by).
Jon 'Where?'
Col (driver) 'By that bus stop back there on your left'.
Jon 'Christ she's a bang'.
*several similar passes later*
Col 'Another successful Christ Drive guys'.