Wiktionary
n. An indoor tabletop game, normally for children, simulating football (soccer), in which plastic straws are blown through in order to move a small ball and score goals.
Wikipedia
Blow football is a children/adults game, popular in the United Kingdom where the object is to blow through some kind of pipe causing a small lightweight ball to pass through the opponent's goal, as in other forms of Football.
The game is often played with whatever materials are at hand, such as drinking straws, and ping-pong balls but is also sold as a boxed game in some toy shops. Boxed games typically contain a few plastic pipes, a ball, and two plastic goals. Some versions may include two plastic goalkeepers on sticks for the players to defend the goal with, or a football pitch laid out on a piece of cloth that is then put on a table and used as the playing surface, or even supply a rigid surface to play on, with raised boundaries so the ball cannot go out of bounds. At least two players are involved, though some sets will supply more pipes so the whole family can play. The pipes may be simple, or may have mouthpieces after the fashion of a pea shooter. The ball may be designed to be hard to move, and correspondingly hard to stop, to make the game more interesting.
One factor in the game is the tendency of players to hyperventilate, or in the case of older adults, run out of breath. Learning to play effectively means being careful when and how hard you blow.
Various versions of the game were produced by Spears Games, Peter Pan Playthings, J & L Randall and several others.