Sue, who is slender, boasted, "Thin is in." So Pat, who is heavy, gave this retort, "Well, fat is where it's at."

[Haseli221]

Dear friends,
Would you please tell me the meaning of the parts in quotation marks in the following sentence?
Sue, who is slender, boasted, "Thin is in." So Pat, who is heavy, gave this retort, "Well, fat is where it's at."

Best,
This sentence is from 'Building vocabulary skills ' by Sherrie Nist.

 

[Barque]

Thin is in = Being thin is the "in" thing. It's fashionable.

Fat is where it's at = It's good to be fat. Being fat may give you some benefits.

The joke, such as it is, lies in the fact that they use rhyming phrases, both with the same general meaning.

 

[Barque]

Both are specifically American colloquial phrases, especially the second.

 

[5jj]

In the sense of being fashionable/popular, 'in' has been around in BrE for many years.

 

[emsr2d2]

Dear friends, Unnecessary. Just go ahead with your question.

Would you please tell me the meaning of the parts in quotation marks in the following sentence?
Sue, who is slender, boasted, "Thin is in." So Pat, who is heavy, gave this retort, "Well, fat is where it's at."

This sentence is from 'Building Vocabulary Skills ' by Sherrie Nist.

Best, Unnecessary.

Note my comments and corrections above. Remember to capitalise each word of book titles.