a condition of extreme nervousness caused by fear, worry, strain, etc.; the jitters; the willies (usually prec. by the): Just thinking about ghosts gives me the heebie-jeebies.
Origin: 1905–10, Americanism; rhyming compound coined by W. De Beck (1890–1942), American comic-strip cartoonist
[hee-bee-jee-beez] 
) Slang.