Top Definition
A portmanteau (combination of two or more words or morphemes, see also wordbining) consisting of all or portions of insane/insanity, Santa, and antics. Describes the crazy acts undertaken by people who are altogether nutty about Christmas and associated decorations, celebrations, music, etc. One who overindulges in these acts could also be called an insantic.
We don't need any insantics like last year- just say no to flaming egg nog!!!

Ridiculous, St. Nicholas, i blame you for my wife and kids being 12ft tree decorating insantics.
by markbe November 28, 2009

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