string bean

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A bushy or climbing tropical American plant (Phaseolus vulgaris) in the pea family, widely cultivated for its narrow green edible pods.
• noun The immature green pod of this plant, eaten as a vegetable.
• noun Slang A tall thin person.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A long, slender variety of green bean.
• noun figuratively A tall and thin person.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun green beans with strings that must be removed