Gin up (or ginned up) means enliven, excite or enthuse. Its probable derivation is from the 1800's British slang term "ginger up," which referred to the practice of putting ginger up a horse's butt to make him spirited and prance with a high tail, for purposes of show or sale. The other term for this practice is the verb "feague." This is confirmed both by the online Phrase Finder from the UK and the OED. The Phrase Finder reports its use in the US prior to 1895.
To gin up support for a cause.
by suomynona99 May 13, 2011
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the state of intoxication based entirely upon the consumption of vast amounts of gin
Clarkie, we should get Bird all ginned up next week
by clarkie18 March 01, 2011
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To create or generate, usually something nontrivial.

(The author believes it should be "gen up", but "gin up" is the popular usage.)
I'll get one of our code wonks to gin up something to convert the data over to the new format.
by Karl Lehenbauer August 19, 2004
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Definition 1) To create or arouse strong feelings in (someone); move or excite.
Synonyms: spur, stir up, drive, rouse, prompt, propel, prod, motivate, encourage; urge, impel; provoke, goad, prick, sting, incite, light a fire under, whip up, work up, foment, fan the flames of, trigger, spark off, precipitate, excite, provoke, incite, ignite.

Definition 2) To fabricate, invent or concoct (something), typically with deceitful intent.
Synonyms: falsify, fake, counterfeit, cook; invent, concoct, make up, dream up, invent, trump up, cook up.

Definition 3) To quickly create something where time, not careful attention to detail, is of the essence.
Definition 1 example: “If anybody tried to open a casino that might compete with Abramoff's tribal clients, Reed's job was to block it by ginning up Christian conservative opposition.”
Jay Bookman, “ADVISE REED NOT TO KEEP HOPE ALIVE.” The Atlanta Journal-Constitution; November 7, 2005

Definition 2 example: “{Chris Mooney} rejects the idea of even "teaching the controversy" over these issues in schools, arguing that the far right has invented the controversy itself by ginning up a kind of faux science alternative that has no solid basis.”
Gregory M. Lamb “SCIENCE AND POLITICS: A DANGEROUS MIX” Christian Science Monitor; September 27, 2005

Definition 3 example "I just don't think we're doing a service to Terri {Schiavo} by ginning up a bill and getting it out quickly in helter-skelter fashion.” Florida House Speaker Allan Bense, R-Panama City, March 9, 2005.
by bugss6 December 19, 2005
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