It's often used in the imperative form "oublie" meaning "forget" or "don't forget".
For example:
* "Oublie tout ça." (Forget all that.)
* "N'oublie pas de prendre ton parapluie." (Don't forget to take your umbrella.)
If you are asking about the word "oublie" in another context, please provide more information and I will be happy to help!