The story
From Pooh + sticks, coined by the English author Alan Alexander Milne (1882–1956) in his book The House at Pooh Corner (1928): see the quotation.
Etymology from Wiktionary, CC BY-SA 4.0.
Poohsticks
Pooh·sticksToday it means: A game for two or more players in which each player throws a stick into a river from the upstream side of a bridge crossing it, the winner being the player whose stick emerges first on the other side. Full definition →