diddle for middle

slang Whoever throws a dart closest to the bull's-eye (the exact center of the dart board) gets to go first in a game of darts. A less common variant of "middle for diddle." Primarily heard in UK. A: "Who's up for some darts, lads?" B: "Cor, I thought you'd never ask. Right, diddle for middle!" A: "All right, gents, diddle for middle!" B: "Well, my aim is terrible, so I won't be going first." Diddle for middle—it's the only fair way to determine who gets to go first.