have a bat
To wank
I think it's the right time to have a bat!
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.
person 2: " im thinking of having a bat.
Have bats in ones belfry
To be crazy or eccentric
She seems to have bats in her belfry.