What is Physics Engine?
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noun.
boobs that move vigorously when jumping or
originated in
look at the physics engine on that girl!
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Come from a episode of Sienfeld. Where you get a couples freinds .. realtives .. what ever and see who can go the longest without mastur..
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They are anyone's nipples
Tom asked me if I played with her pink little twittles while we had sex.
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