I've never heard it called that before

The word "it" refers to a sex act, bodily organ, etc. for which the speaker's phrase might be construed as a euphemism.

• Audio (Southern England):

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I've never heard it called that before

1. (informal) Used to draw attention to a possible, and usually unintentional, double entendre in the immediately preceding utterance of another speaker.

   Synonym: is that what the kids are calling it these days

• For quotations using this term, see Citations:I've never heard it called that before.

• that's what she said