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3.
To "shit" yourself or be realy scared of a certain particular moment in a game or in real life
Oh god damn that fucking bitch came out of no where im fucking Juicing it
by JustJuicedit July 04, 2010
 
1.
Automotive/racing term. Denotes a vehicle running/racing WITH nitrous oxide assistance.
Synonyms: On the bottle, On spray, With NOS, On nitrous, On NOS.
Antonyms: On nuts, On the motor.
"That car runs the quartermile in 10.1 seconds on the motor; but it does 8.9 juicing it".
by Dr. DVS December 22, 2007
 
2.
it's an expression, like if you juice something you're going too hard and trying too hard or taking everything for what its worth even when you know there's not much more to it.

can be said in different ways for the lulz.
"this is a juice"
"this is juiceful"
"this is juicin it"
"this juice type shit"
Wrestler 1: The ref called locked hands when one of his hands was on the other guys head!
Wrestler 2:Yeah, dude juiced it.

"The biology teacher gave us a 14 page final exam review when the exam is only 8 pages. She's juicing it."
by kawaiichandesu January 14, 2012