The same meaning exists in English as well, as a verb. Commonly found in aviation. The alternative meaning of "mentally-disabled person" is derived from this m

The same meaning exists in English as well, as a verb. Commonly found in aviation. The alternative meaning of "mentally-disabled person" is derived from this meaning, as their brain is "slow" / "delayed". That repo was absolutely using it in this latter sense - "WebM for retards".