The context of the following conversation is Alex needed to pick up milk and bread on the way home, so Alex drove to the store from work one night.:
Alex says I was at work and I remembered that I was out of stuff like bread and milk when I was on the way home..
The friend responds Did you run to the store when you got home and pick up some groceries?.
Alex responds Nah, I just stopped on the way home from work that night..
The friend responds That's probably the easiest way to do it, even  if you're tired..
Alex responds Yeah.  I was exhausted.  When I got home, I realized I had forgotten eggs and cheese..
The friend responds  You're such an airhead ..