The most famous line of the character from Kuroko's Basketball, Kagami Taiga. It's when people in japan tend to all rush and flock in a food establishment (in the anime's case, the school cafeteria) because the japanese only have a 30 minute lunch break. That sucks.
A lunchbox friend is someone you only talk to at school and never hang out anywhere else.
They usually talk about gossip and people who they want to fuck and talk behind your back.
They’re fake and probably only hang out with you for clout or just because you pose a threat towards them.