Who doesn't want to load up the Fat Man with infinite nukes and let Diamond City know who's boss? Just the one time, maybe? And it's a shame: I remember loving cheat codes as a kid, whether I was using them because I couldn't beat a level or because I just wanted to screw around.
It's a codified nod to the cheat codes of yore, something that developers never seem to put in their games these days. The cheat menu is basically what it sounds like: a menu that gives you infinite caps, ammo, materials, perks, quest items, bobbleheads or whatever else you want (godmode is having an issue on Xbox One, it would seem).