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Coffee. Because coffee usually contains caffiene it gives some people jitters.
When Fred woke up this morning he drank a cup of jitter juice to wake up.

We will be here all night, better brew up some jitter juice.
by barbamatt May 23, 2010
The sandalwood smelling oil that jitters,crusties and general soap dodgers bathe in. The resulting smell is a cross between a joss-stick and BO. Term originated late 1980s/early 1990s in Bristol, UK
' Do we have to go to Bristol Bus Station? It totally honks of Jitter-juice!'
by Derek Fowler May 19, 2014