do "someone" in - As an idiom that stands alone, this is easy to explain. It means "kill someone". If someone does someone in, then someone kills someone.
wiggle my plate - I'd say this means bother or disturb in some way.
That live cat didn't kill me, but it did upset me - or disturb me.
The phrase "do in" does not have to mean "kill", but it often does.
do in Slang. do: Definition, Synonyms from Answers.com
This is slang, but not all phrases, as such, are classified as slang. In my experience, some ESL speakers seem to have a different idea about expressions or idiomatic expressions. Idiomatic expressions are not slang; they're expressions - idiomatic expressions.
- To tire completely; exhaust: The marathon did me in.
- To kill.
- To ruin utterly: Huge losses on the stock market did many investors in.
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