The meaning of "kiss-your-sister"

Could anyone advise me the meaning and origin of "kiss-your-sister" in the following sentence:

Sen. Mitch McConnell (R-Ky.) said he is opposed to "kiss-your-sister language," but agreed that the need for censure may turn out to be bipartisan. "By and large, it's better not to do it," McConnell said. "But this is an unusual event, and leaving it with just acquittal does leave you with an empty feeling that something needs to be said."

Thanks in advance.

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• “不痛不痒”，“装模作样” - 冰心 19991126014831
  • Thanks 冰心 - Jinwf 19991126052147
    • I don't find it in any dictionary either, but can understand it in the context. - 古月 19991126120406

“不痛不痒”，“装模作样”

Thanks 冰心

I don't find it in any dictionary either, but can understand it in the context.