(as) slick as a whistle smile
(adj) (Used to describe one's manner or movement) fast, skillful, or even and regular.
Wow! his head movement is as slick as a whistle! His opponent can't hit him.
She was as slick as a whistle when swinging herself over the gate.
(adv) In a fast, smooth, or skillful manner.
He negotiated as slick as a whistle and managed to reach a sweet deal.
Slick as a whistle, the driver avoided potholes, puddles, and pedestrians.
Very quickly
Very fast.
To help something run or work smoothly or successfully
Quickly and effortlessly
This simile was first recorded in 1830.
To be very wet
Because of forgetting bringing an umbrella, I look like a drowned rat when it rains.