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adj. bat·ti·er, bat·ti·est Informal
Mentally deranged; crazy.

[From bats in the belfry.]

bat′ti·ness n.


the characteristic of being batty; craziness; insanity; eccentricity
References in periodicals archive ?
Throwing together two of movieland's most eccentric talents was always likely to produce a perfect storm of battiness, and the marriage of Werner Herzog and Nicolas Cage is precisely that.
This confirmed we were in safe hands for this very British tradition of seasonal battiness.
While Steve Carell (star of The-40-Year Old Virgin) is extremely good at times, his character doesn't always fit easily with the general battiness of the Hoover clan.