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2. Clownery
When apparently mature young ladies suddenly and ferociously act absurd.

Also see:

Immaturity
Ridiculous
Outrageous
Wow, I can't believe she did that to you. You know what, it's straight clownery.
1. clownery
Acting a damn fool. Bafoonery, coonery, etc.; often for laughs, sometimes unwittingly at your own expense.
What the hell is all this? These people are taking part in pure clownery.
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