Visit you maker is just another way of using the phrase “meet your maker”. If someone meets their maker, they die.

Fire & Brimstone is a reference to the tradition of cremating someone after they die. During cremation, body is burned down to dry bone. It is usually done for religious purposes or so the body can be rid of quickly instead of over time.

Along with cremation, fire and brimstone is also a visualization of hell. In Christianity, hell is described as a place of fire and brimstone.
Revelation 21:8 says:
But the fearful, and unbelieving, and the abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the lake which burneth with fire and brimstone: which is the second death.
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Real recognize real is an idiom in hip hop that means if you are real then you’ll know the other people that are real like you which means that they are not fake and true to them self