To "bag," or "bagging". To crack jokes by insulting someone or their mother. I believe this is West Coast oriented, as I grew up in Los Angeles hearing this term, but in the military I met people from other regions of the nation who never heard this. But people from California knew what "bagging" meant. Most called it "jone-ing". See dozens, dirty dozens, jone.
Oh, you wanna bag? Yo momma so fat, she's on both sides of the family!