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the highest knuckle on your hand while masterbating.....
the second joint of your thumb while making a fist ..
the same would be implied for females using artificial stimuly {viberator}
i keep banging my tug knuckle on the table
my tug knuckle is sore
you're such a tug knuckle ! ! ! !
via giphy
by THE-HILBILY January 19, 2018
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