Last one in is a rotten egg

Meaning

A playful challenge used to encourage racing or speed, usually among children playing in a pool or running to a destination. It casts the loser as a smelly, spoiled egg.

Playful, nostalgic

Used in a sentence

• Everyone to the lake, last one in is a rotten egg!
• Last one in is a rotten egg, they yelled as they ran toward the ocean.
• We raced to the car, knowing the last one in is a rotten egg.