When a girl is suckingyour cock and you plug her nose to force her to suck harder, fighting for air.
Bella was sucking Craig's cock when he reached down and plugged her nose. When this happened, Bella tried breathing but found all she could do was suck his dick harder. As she fought for air she pushed herself off and asked, "what the hell was that?!" Craig replied, "you've never tried the Nose Plug Method? Now you have."
Jon's early morning meeting was iterrupted by a reminder of his nachos & beers the night before. He quickly stood up and said, "Excuse me fellahs. I need to go 'plug the meter.'" Those in the know understood he really just needed to take a crap.