Meaningless parlor game created in Victorian 1890's England in which the objective is to shoot "winks" into a cup. Commonly used today to disparagingly call something trivial and unimportant.
Guy1: Hey man I'm off to play a game of pickup volleyball at the park, want to come?
Guy2: Nah I'm off to play some tackle football, but you can call me when you're done playing tiddlywinks.
"I made 7 grand on the Google IPO, but that's tiddlywinks compared to what the Sergey Brin made."