hectic, chaotic; extremely eventful, action-packed, exciting; ostentatious, flashy ...1945 colloq., orig. US
a colloquial pronunciation of hell is (a-) popping (events are unfolding in a chaotic manner); the use of one-word form was popularized by the title of the 1941 U.S. film Hellzapoppin' and the 1938 theatre musical Hellzapoppin
FIRST DOCUMENTED USE
1945 - see EXAMPLE below
"...The Detroits floundered hilariously into the world championship in seven hellzapoppin' games...."
From: The Wisconsin Rapids Daily Tribune
Dec 27, 1945