An illegal move in football, often mis-understood and often questioned by females with no football knowledge to their more football-aware partners.
Imagine you are in a shop queuing in single file. The girl in front doesn't have her purse, then you realise you don't have yours. The solution is your mate at the back can throw you hers. Once the purse is thrown you can dodge round the girl in front, catch it and run to the cashier. BUT, you must remember that until your mate has "actually thrown the purse" it would be wrong to be in front of the other girl and you would be OFFSIDE!!