1 definition by TUAmigo2012

Top Definition
Just as "s on my d" is suck on my dick, b in her m means to blow your load in her mouth.

Caleb: "That girl gave me a blowjob last night."

Zach: "Did you b in her m?"

Caleb: "Yup,then she swallowed..."
by TUAmigo2012 April 01, 2009

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