Whooping cough..Violent cough causing the victim to move and heave to clear the chest.....not so much the term but the way it was used by a certain fellow in his description of how it might effect or in his case enhance love making......
In the process of courting a young lady you try your luck by moving your head in the direction of her lips. This act usually occurs at the end of a social night. This may result in a "Shift" or a "slap" both of which you can "chat" to the boyz about.