5m-20m xp per kill on MW2?

I just decided to play a S&D games for some xp and I got put in a game where I was getting 5m-20m xp per kill which was basically w/e level u were to level 70 I got 3 prestiege from this and was wondering how this was done and if it can be redone?

went from being a nooby level 55 to being 3 prestiege.

 

Infections from a Jtag.

 

I have joined on server and i got msgs, ALL ITEMS NOW ARE UNLOCKED PRESS "X".
When i press it i become max lvl and all weapons unlocked.. when i maked prestige mode and start again.... the same...
So in 10 mins.. 3x70 lvl for me
Also in the middle of the screen i had a msg "The admin is watching u DONT CHEAT" , but the server has auto aim
LOL but nice one

 

Never heard of infection from a Jtag all I know I was getting 5m-20m+ per kill and the game was moving in super fast mode

 

Infection Xp lobby message me if you want me to do it (if you play on xbox)

 

You joined a hacked lobby. Be careful in those lobbies because the owners of the lobby can de-rank or level you

 

messaged u magic