jitters jitters /ˈdʒɪtɝz/

noun

1. Extreme nervousness  ( heebie-jeebies [Informal] , jitters , screaming meemies [Informal, N. American] , jim-jams [Informal] , screaming abdabs [Informal, British] )
   extreme nervousness
   

 jitter jitter /ˈdʒɪtər/

noun

1. A small irregular movement  ( jitter )
   a small irregular movement
   
2. Small rapid variations in a waveform resulting from fluctuations in the voltage supply or mechanical vibrations or other sources  ( jitter )
   small rapid variations in a waveform resulting from fluctuations in the voltage supply or mechanical vibrations or other sources