beat the dummy:

To masturbate , said of a male, and based on the assumption that the little-head is dummer than the big-head (a belief subject to much controversy). See masturbation-male for synonyms.
See Also: beat to it, beating fantasies, BTSOOM, dead beat of one's heart, foken, kick ass, pound the pavement, pound the sidewalk, pound the street, tachycardia

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