A bludgeon. (A college word.)

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1849.  In this year “The Yale Banger” appeared.

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1856.  B. H. Hall, ‘College Words, &c.’

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1853.  He is prone to sport, especially in the evening, a huge stick suggestively called a “Yale Banger.”—Yale Lit. Mag., xix. 2 (Oct.).

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1854.  

        The Freshman reluctantly turned the key,
Expecting the Sophomore gang to see,
Who, with faces masked and bangers stout,
Had come resolved to smoke him out,
And give him a puff he could do without.
Id., xx. 75 (Nov.).    

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1856.  Brandishing a banger above my head, I came on to the stage with a yell.—Id., xxi. 282 (June).

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