Dipping the bag

one step further than balls deep. To insert your penis fully into a vagina to the point where you are also able to insert you testicles.

Not to be confused with Bopping the bag.

I heard he was dipping the bag with Sonia last night.

dipping into the black bag

taking drugs you have possession of. This is an old-school musician/junkie reference to when doctors used to make house calls, with their equipment in a black valise style bag containing stethoscope, thermometer, and, most importantly, drugs.

Man, you are nodding out and can barely stand up. You been dipping into the black bag again ?