Get a PC computer and Net Tools (GOOGLE IT)
1. Open Net Tools
2. Hit Start, then Net Tools
3. Scroll Down to find UDP Flooder
4. For the top bar put in exactly this : 27.27.27.27
5. For the bottom bar put in exactly this : DataDataDataDataDataDataDataDataDataDataDataDataDataDataDataDataDataDataDataDataDataDataDataDataDataDataDataDataData
COPY AND PASTE THOSE ^^^
6. Get on xbox and become the host of a game ( I recommend appearing offline as to not show up on Recent Players and modding your gamertag to something that doesnt look modded so they dont recognize your gamertag anywhere
7. Hit "Start" and everyone but you in the game should start to laggggggggggggg.
8. Obviously hit "Stop" to stop the madness
HAPPY MODDING 
