I'll be Johnny-on-the-spot all right, and have it ready for you.
"Allus glad to be Johnny-on-the-spot," smiled the older man.
When they want it, every one of these memoranda must be Johnny-on-the-spot before they can dig up the mazuma.
Im the Johnny-on-the-spot when it comes to prescribing healthful stunts for the working classes!
We've got to watch every corner, that's all, and be Johnny-on-the-spot when the time comes.
But when Wunpost went back and opened up this vein Mr. Eells was Johnny-on-the-spot.
Henri missed these remarks, for he was Johnny-on-the-spot to retrieve the game.
Well, I can't make him prompt at school; but he'll be Johnny-on-the-spot if you say so.
Sadie couldn't get it through her head, though, that I wasn't a Johnny-on-the-spot.
My name is Johnny-on-the-spot, returned the irrepressible Jerry over her shoulder.
A person who is ready and effective when needed: Ed was Johnny-on-the-spot and we got it cleaned up quick (1896+)