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A large ball placed in the mouth with straps that tie at the back of the head so the Sub can't speak to the Dom.

Mike could't say the safety word during an act of submission to his Dom because he was wearing a gagball
by Wind~ August 06, 2007
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A sex toy placed in the mouth of one partner to stimulate pleasure while being fucked in the ass.
Ernie loved using gag balls when Bert fucked him all night long.
by pamedic May 16, 2009
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