A person who fears failure so much that doing nothing is the best option. One who fails to reach dreams by making excuses and citing reasons why it won't work. Someone so paralyzed by fear of rejection that inaction is the chosen path.
"You write really amazing poetry, Biff, if you weren't such a crutchmonger you could get them published and stop feeling sorry for yourself."
This is a variety of teenage/adolescent female who tries to gain favored status with teenage males by always sitting on their lap. They also like to sit on the laps of older men to gain the same status.