jitterbug /ˈd͡ʒɪtə(ɹ)bʌɡ/noun 4verb 1forms 3 noun4 •(informal) A nervous or jittery person. •An uptempo jazz or swing dance which embellishes on the two-step pattern and frequently incorporates acrobatic style swing steps. •A jazz musician or aficionado. •Synonym of diddley bow (“type of stringed instrument”). verb1 •To dance the jitterbug. formsjitterbugged · jitterbugging · jitterbugs