Plain English Meaning
It is a departure procedure designed to keep you clear of obstacles after takeoff, drawn out on a chart instead of written as a paragraph of instructions.
Full Definition
An Obstacle Departure Procedure that is published in chart form rather than as a text-only narrative. A graphic ODP shows the departure routing, altitudes, headings, and obstacle-avoidance instructions on a dedicated chart, and is identified by the word '(OBSTACLE)' in the procedure title.
Context Anchor
Seen during instrument preflight planning and on published departure procedure charts for airports that need a charted obstacle-clearance .