First of all its hacking because i know exactly what you are describing
its called a "mod menu" and gives you things in game by a click of a button such as..
1. XP lobbies + or -
2. Change rank [prestige rank up or de-rank any player]
3. your common hacks [cheats] such as moon jump, flying, inf ammo, hp, etc.
Last but not least this kinda talk isn't allowed on here soooo reported ^_____^