Magad can be added to the end of a Verb that is Animate and Intransitive (VAI) into a verb that is Intranistive and Inanimate (VII).Which is to say it makes a verb that would be about an animate object about an inanimate object.
So Wiisinii: vai wiin is eating becomesWiisiniimagad: vii it is eating
You can find the thread of discussion on this link from the Ojibwe Language Table facebook group:https://tinyurl.com/Ojibwemagad 
Here is a link to Charles Lippert’s excellent online dictionary:https://www.freelang.net/online/ojibwe.php