The only way to do it is to delete the map pack from your console. You will keep your peace keeper if i am correct but no longer have the maps. Unfortunatly there is no options to turn it off temporarely other than deleting it.
What Raz0r said. You can always go back and download it again later, so it's not like you are losing it forever. The DLC isn't a total lagfest in BO2 though like it was in MW3 (for me anyway).
Do what the video says then restart your PS3, it should work
Note: you will not be able to use the Peacekeeper but do not lose any camo's or unlocks acheived for it
Don't buy the maps in the first place until they address the real problems would be a better fix.