Sam offered Will a piece of gum and then Rob and Kevin asked, and then grabbed without recieving any answer, some gum for themselves. Thus the chewing gum effect was born!
Chain chewing gum. When you're anxious about something and start maniacally chewing one gum after another (normally dedicating a few seconds to each gum, not taking all its flavour).
It can get addictive when you're really nervous. Its like soft drugs for kids. Afterwards, you feel funny.
Child: What are these balloons doing in your bottom draw mummy?
Mother: Those are mine and daddy's adults chewing gum, the mint in them is too sting for little kids.
it is a continuation of the fag game; you stretch your sack out through your fingers and mention something about your chewing gum... it is vital that you say something odd enough to make someone look at it.