Can we do this.... yeah?!?

For the last three days, Tony has been using the above-mentioned grammar pattern.  Anytime he wants to suggest a course of action for us or me, he has been stating the hoped-for action and then adding a "yeah" which is either exclamatory or interrogatory.

I assume he picked up this annoying pattern from school, but from whom?  Are the teachers teaching him this?  Is there some young foreigner, drunk when not teaching, who taught him this?

If I had the time, I would investigate.