Yo, if you have to ask, you probably shouldn't be having the conversation. We're going to give you a tip, OG, means ORIGINAL – Original Gangster for those of you too young to remember Ice T's rap career. If you bought a pair of Js that say Retro on the box, they aren't OG. So when you ask this, don't be surprised to have someone smack you all the way back into the past. Now that's retro.