That's a rugby term yeah. In fact it's a Rugby league term, the version of the sport which I may well be playing again soon, should anyone ever get back to me.
Basically: The whole objective is, as standard, to get as far up the pitch as possible whilst retaining posession of the ball. If a player looks like they're about to be tackled (And in league once your team has been tackled five times the other side automatically gain posession) then they can kick to touch, namely the touchline at the other end of the field. It then becomes a race between the teams as the ball becomes wild and whoever gets their hands on it first keeps posession. If you get it, then you're less than five metres away from the other team's touchline. If they get it, then you've got their entire side to get through to get to the ball.
Think that's about right.