It's probably what you see at the bottom of this definition, except with one extra "get a". When you make that advertisement have a mental breakdown and say the phrase "get a" over and over again.
Get a get a get a get a get a get a get a get a get a get a get a get a get a mug!
Get your get back basically means to get whom ever did anything to you (usually bad) to get them back and get revenge it’s used by people who are from the hood