Definitions by TUAmigo2012

b in her m 

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..."

b in her m by TUAmigo2012 April 1, 2009