"Slick as a whistle" nghĩa là gì?

Ví dụ

However, Nava is cool as a cucumber and slick as a whistle. She has seen it all and was never flustered.

Slick as a whistle. The second big feature for me personally are the ports. I like USB-C ports and there’s plenty of that on the laptop. You get four USB-C ports with Thunderbolt 3, a full-size SD card reader, and a headphone jack. Missing are HDMI and USB-A ports but in the box is a dongle. I don’t like dongles because it’s messy and ugly. Sorry, that’s just me.

Head coach Hugh “Pee Wee” Hamilton “was very small, as strong as an ox, and had about 3% body fat,” former linebacker Brian Hunter said, “and I remember him being at the old gym at Asheville High. He would pull himself up a rope hanging from the ceiling and point his toes straight down, and, with just his arms, shinny up and down as slick as a whistle. Then he’d turn his back to the rope, and go up and down backwards.”

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