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Like the more notable, strap on, the dick on a belt allows a person without a penis to engage in pleasuring their partner(s) with a large, hard, cylindrical object.

The dick on a belt can refer to a homemade strap on as well, which is constructed of your everyday dildo/vibrator, a belt & perhaps some duct tape.
Jenny came over last night and fucked me with her dick on a belt.
by Garrand57 April 19, 2011