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Adjective meaning fantastic or fantabulous. Has the word 'rhubarb' in it purely because it's a great word, and a tasty fruit.

Could typically be used by posh people instead of the usual 'spiffing'.
"I'm having a great time tonight, aren't you?"
"Yes, darhling, rhubarborous!"
by rvs743 August 31, 2006
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