Johnny-on-the-spot

noun Informal.

a person who is on hand to perform a service, seize an opportunity, deal with an emergency, etc.

Origin:
1860–65

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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American Heritage

Idioms & Phrases

Johnny-on-the-spot

A person who is available when needed, as in He always is there at the right time, a real Johnny-on-the-spot. [Late 1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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00:10

Johnny-on-the-spot is always a great word to know.

So is ninnyhammer. Does it mean:

a gadget; dingus; thingumbob.

a fool or simpleton; ninny.

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