The act of ejaculating in someone elses mouth, thus giving them an ample serving of protein.
Dude, after she was done blowin me last night I put that bitch on a protein diet.
A diet consumed by a person, only served to them by a man. Purpose is for weight loss. The only sustenance is provided to them by their male partner ejaculating in their mouth.
My bitch's ass was getting big so i put her on the protein diet.