Thank you for quoting the correct version of the song.

Now get off my lawn.

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It was Lewy Body Dementia, I remember because my grandma had it. It’s non-hereditary thankfully, but just as debilitating as Alzheimer’s.

I like ‘bob’s your oyster’ because both original phrases are nonsensical to me. Is there a word isometric to portmanteau but for phrases / idioms?