Juicy Ready To Die Notorious B.I.G.

now my mom pimps a Ac'

Ac' is short for Acura, a 'luxury' line of cars made by Honda but branded as Acura
now that Notorious BIG is rich, he bought his Mom an Acura (Ac) which she pimps (drives around in it looking like she's in charge and living a luxurious lifestyle)