Americans might say that something is the cat's meow and the cat's pajamas.

VOA: special.2009.09.27

There is a cat outside the apartment building that starts to meow and the boys are interested in it.

男孩儿们对楼外,叫唤的猫很感兴趣。

耶鲁公开课 - 1945年后的美国小说课程节选

It was noted that this has "nothing to do" with the scapegoat-of-the-year (Li-ion cells), but if you (or your offspring) just loves to cuddle with this volatile critter, you should probably ice the situation before it unleashes something a bit more serious than a cat's meow.

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"Meow meow" or "M-cat" is the common name for mephedrone, which until 2010 was legal to buy but not to consume as a drug.

BBC: Charges in Greater Manchester after mephedrone drug raids