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Pushing your testicles between the legs, over the taint, then squeezing the legs together to hold, expose and display a taut ball sack at the base of the ass crack.

A skilled moon baller can walk around in this position displaying his wares for those that dare to catch a glimpse.
Everything was great at the family dinner until uncle Fred came out of the bathroom doing the ol’ moon ballin’.
via giphy
by Eaton Holgoode June 04, 2018
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