cat's crack 

To make a complete mess of something, to fail miserably to achieve your objectives.

WIFE: Did the furniture arrive from IKEA last night?
HUSBAND: Yes.
WIFE: Was my fold-away bed couch with built-in foot spa there?
HUSBAND: Yes.
WIFE: Ooooh!! Will you assemble it for me?
HUSBAND: I started on it last night, but I made a cat's crack of it.

cat's crack by Mícheál Mac Fheorais May 15, 2006

The Cat’s Crack 

The phrase "the cat’s crack", meaning "the height of excellence", was first coined in jest during a family conversation about the low-riding waistline of one family members pants, Catherine(a.k.a- Cat) in Northern New Jersey on April 15, 2018. It can be used interchangeably with the phrase “the bee’s knees” that first became popular in the U.S. in the 1920s, along with "the cat's whiskers" (possibly from the use of these in radio crystal sets), "the cat's pajamas" (pajamas were still new enough to be daring), and similar phrases that didn't endure: "the eel's ankle", ...

Those cookies are the cat’s crack!

The Cat’s Crack by Don Waldoy April 16, 2018

the cats crack 

The phrase "the cat’s crack", meaning "the height of excellence", was first coined in jest during a family conversation about the low-riding waistline of one family members pants, Catherine(a.k.a- Cat) in Northern New Jersey on April 15, 2018. It can be used interchangeably with the phrase “the bee’s knees” that first became popular in the U.S. in the 1920s, along with "the cat's whiskers" (possibly from the use of these in radio crystal sets), "the cat's pajamas" (pajamas were still new enough to be daring), and similar phrases that didn't endure: "the eel's ankle", ...

That car is the cats crack.

the cats crack by Don Waldoy June 24, 2020