having a bat

To engage in the act of masturbation. Can also be known as 'whacking it'
person 1: "ey why u watching that porno for"
person 2: " im thinking of having a bat.
by Markwick October 6, 2009
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have a bat

To wank
I think it's the right time to have a bat!
by thewizardandhisfellows September 14, 2013
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Have bats in ones belfry

To be crazy or eccentric
She seems to have bats in her belfry.
by Light Joker March 15, 2004
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