Definition

Completely focused and committed to a task or goal, operating at peak productivity. The state of hyperfocus where distractions cease to exist and you're one with your objective.

Example Usage

Can't hang out tonight, I'm locked in on this project until it's done.

Origin

Sports and gaming terminology that spread to general productivity discourse

Fun Fact

The phrase is often declared right before someone proceeds to get distracted for three hours, making it more aspirational than accurate.

Source: Sports and gaming culture