I didn't realise this was a word peculiar to the British isles!
Conkers is both a game played by children and the item with which they play the game: namely a horse chestnut. The conker is threaded on some string through a hole a responsible adult drills through the conker. You play by letting the conker hang freely from the end of the string and then taking turns with someone else striking each other's conker until one of them breaks. Ever time a conker breaks a rival one, its score (its racing form if you like) increases. So a conker that has destroyed 10 others is a ten-er.
For obvious reasons conkers is traditionally played during the autumn months. Serious players will collect horse chestnuts and save them for a year in order to harden them up, before bringing them out onto the playing field.
Horse chestnuts should not be confused with their cousins, sweet chestnuts which are very tasty and often used as a stuffing with the Christmas turkey or goose.








