Top Definition
the act of masturbation with the non dominant hand...thumb facing towards the balls.
i have myself an underbob last night....felt like someone else was doing it.
by Geoski July 24, 2006
1 more definition
the act of masturbation with the non dominant hand...thumb facing towards the balls.
i have myself an underbob last night....felt like someone else was doing it.
by Geoski July 24, 2006

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