An acronym, meaning Sit Bitches, Get Money. Originating from ancient times in canonical texts. Many women in these times considered babysitting a form of money making, including young teenagers. Sbgm is used to express the act of babysitting bitches, while getting paid currency. This acronym would be used online or while texting just like 'lol' or 'gwaf'.
Guy 1: Hey, my fellow white bread cracker friend, how are you doing on such a fine day?
Girl 2: Great! I'm just doing some babysitting, ya know, sbgm.
Guy 1: Hell yeah mothafucka, sounds pimpin'.