From a dictionary:
"heebie-jeebies" - plural noun ( the heebie-jeebies) informal; a state of nervous fear or anxiety, e.g. "It takes a lot more than a stupid ghost to give me the heebie-jeebies."
ORIGIN 1920s: coined by W. B. DeBeck (1890–1942), American cartoonist, in his comic strip Barney Google.