Fifo

The internet slang term “Fifo” stands for “First In, First Out.” It is often used to describe a system or process in which items are handled or processed in the order they arrived or were received.

Examples:

When I’m organizing my to-do list, I always follow the Fifo method, completing tasks in the order they were added.
In our online chat group, we have a Fifo rule where we respond to messages based on the order they were sent, ensuring fairness and equal attention to all members.