English · Slang Attested 18+

kiss your sister

In real, traceable use. Part of the curated seed collection; community review is coming.

Meaning · English

Synonym of KYS (“kill yourself”).

⚠ Register: offensive, slang

Where it’s used: Used American English

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).

Topics: Family

Common questions

What does “kiss your sister” mean?

Synonym of KYS (“kill yourself”).

Is “kiss your sister” formal or informal?

kiss your sister is generally offensive, slang.

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