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1.
A "gooseberry" is a person who will tag along to a couple or a few couples, but they themselves are single, usually being an ugly friend or accquiantance who you can't bear to leave out as he/she will feel awful.
A friend who come with you and your boyfriend/girlfriend to the cinema.
by John February 21, 2005
 
2.
Phenomenon of being the odd person out.
1. Single gooseberry: In an uneven group eg. 5 people, two pairs of people are talking, with one being the gooseberry or odd one out.
2. Multiple gooseberries in one large group. Eg. in a goup of 6 talking at a table, two sets of people on the lengths of the table can be talking with the two people at either end not talking. Thus there is two gooseberries.
There is no limit to how many gooseberries there can be as any number of people can be singled out
by Norfolk and Chance November 15, 2007
 
3.
A single person (or person without their significant other present) who goes somewhere with a couple. In turn usually making it awkward for both the couple and themselves when the couple wants to do things such as making out.

In america, I think you call it a third wheel.
Kelso : "Hey guys! Wanna play monopoly? Wanna watch wrestling?"
Hyde and Jackie : No Kelso. Go away.

Kelso : But... I wanna hang out with you guys!
Hyde : Don't make me poke you in the eye!
*Kelso Leaves*
Hyde to Jackie : Now we can finally make out without that gooseberry watching us!
by ItAintHalenIfItAintRoth August 14, 2010
 
4.
A Canadian person age 14-21 that owns a Canada Goose branded jacket and owns a Blackberry. Usually these people have parents that are very rich and wealthy. Both of these items to these people are not necessary. They might as well buy a cheaper phone or a wayyyy cheaper jacket.
A Gooseberry will go to a mall every day to shop for new clothes.
by Mr Big Sanchez March 03, 2011