It's the past participle of the verb "kubariki", which means "to bless".
You can use "barikiwa" in various contexts like:
* "Mtoto huyu barikiwa." (This child is blessed.)
* "Nimebarikiwa kuwa na familia yangu." (I am blessed to have my family.)
* "Nchi yetu barikiwa na rasilimali nyingi." (Our country is blessed with many resources.)