gooseberry -
An additional person who is neither necessary nor wanted in a given situation.
Wikipedia
The gooseberry is a species of Ribes, native to Europe, northwestern Africa and southwestern Asia. It is one of several similar species in the subgenus Grossularia; for the other related species (e.g. , North American Gooseberry Ribes hirtellum), see the genus page Ribes.
OmegaWiki Dictionary
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gooseberry An additional person that is neither necessary nor wanted in a given situation.
gooseberry Spiny Eurasian shrub having greenish purple-tinged flowers and ovoid yellow-green or red-purple berries.
gooseberry Currant-like, yellow-green or red-purple berry used primarily in jams and jellies.