ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷ ̷ ̷ˈ ̷ ̷ noun
Usage: usually capitalized J
Etymology: from the name Johnny + the phrase on the spot
: one who is on hand and ready especially to perform a service or respond to an emergency
luckily he was Johnny-on-the-spot … and was given his highly important post — John Dean