Here are some possibilities for what it might mean:
* Gave it at the office: This could mean someone put in a lot of effort or worked hard at their job.
* Gave it their all at the office: Similar to the previous example, this could mean someone was dedicated and fully engaged in their work.
* Gave a presentation at the office: This could refer to someone presenting a project or proposal in their workplace.
* Gave a party at the office: This could mean someone organized a celebration or social gathering at their workplace.
Without more context, it's impossible to know for sure what "gave at office" means.
If you can provide more information about the context of the phrase, I may be able to provide a more accurate interpretation.