What is 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..."
See blowjob, suck my dick, b in her m, swallow, cum, fellatio, blow