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In Massachusetts everyone swerves across lanes without using blinkers or even looking, therefore a Massachusett's Lane Change is when someone is going at it and decides to switch orifices (Pussy to Ass) without any forewarning to the woman, its a complete surprise.
Vinny: Yeah dude, I pulled the Massachusetts Lane Change on her last night, she freaked out.
Johnny: Did she cry?
Vinny: Yeah a little bit, mostly because she never had anal before, I told her I slipped.
by Tom Sumner August 08, 2008
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