In Lebanese and Palestinian Arabic:
* It's pronounced "kee-beh" with a long "e" sound like the "ee" in "see".
In Syrian and Iraqi Arabic:
* It's pronounced "ki-beh" with a short "i" sound like the "i" in "bit".
In English:
* It's often pronounced "kee-bah" with a long "a" sound like the "a" in "father".
However, it's perfectly acceptable to use any of these pronunciations as long as it's understood.