subs. phr. (venery).—The penis: see PRICK. [BALL = a generic name for a horse.]

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  c. 1707.  Old Ballad, ‘The Trooper Watering His Nagg’ [FARMER, Merry Songs and Ballads (1896), i. 192].

        When Night came on to Bed they went,…
What is this so stiff and warm,…
Tis BALL MY NAG he will do you harm.

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