She does it several times. I think now it might be a reference to " Uncle Matt" or " Andy." Watch at :05, again at :45, at :58, at 1:06 - 1:12, at 1:30, and at 3:15.
The one at :45 seems to be Uncle Matt, but at 1:30 and at 3:15 it seems to be Andy. So maybe it means "man" and there is...