Plain English Meaning
The airplane is too high as it lines up to land. If the pilot does nothing, it will pass over the spot they were aiming for and land long.
Full Definition
A landing approach in which the airplane is above the normal glidepath during the final approach segment, resulting in an aim point that would carry the airplane beyond the intended touchdown point if no correction is made.
Context Anchor
Encountered during landing practice and traffic pattern work, when judging whether the airplane is on the correct path to the runway before touchdown.