pack-a-lunch
When someone is completely lost in the middle of a party and no one feels bad about it. It’s like they’re the only one who forgot the invite.
My cousin showed up to the birthday bash and didn’t know what was going on. Pack-a-lunch.
At the concert, my friend was just standing there like he was waiting for a bus. Pack-a-lunch.
He showed up to the game and didn’t know what team he was on. Classic pack-a-lunch.