Kneading the dough
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Mindlessly playing with ones ball sack while doing something else, such as watching TV. Usually done when the scrotum is warm and [pliable]. Not so much a sexual move as much as something done from boredom.
Masturbating in such a furious and severe manner that it looks like a Russian house wife [making bread]. Due to the severeness the sounds can be very similar to [kneading bread].
Kneading the dough meaning & definition 1 of Kneading the dough.