dad: i can't see a damn thing round this [lorry]  me: dont worry, just do the big-fish-little-fish
a manoeuvre performed when you're on a roundabout and a large vehicle (van/lorry) blocks your vision
"dad: i can't see a damn thing round this [lorry]  me: dont worry, just do the big-fish-little-fish" What is the definition of "big-fish-little-fish"?