Cheat codes are becoming an increasingly rare thing in games. Maybe everyone's just too serious these days or, more likely, games are just so easy that you simply don't need them.
Thank [deity] then for Rockstar Games - who just decided to keep on trucking by inserting cheat codes into their products. The original release of GTA V in 2013 had them and they've made their way back for the new gen version of the game. To make them work, you just have to open up your in game cell phone and type in these codes.
Then fun stuff happens!
Slow Motion (enter 3 times for more effect)
Spawn PCJ-600 Motorcycle
Spawn Rapid GT
GTA V is out now on PS4 and Xbox One - a PC release is coming in January 2015.