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1.
A group of close friends within a bigger group of close friends

A jega is a group of 4 friends; 2 males and 2 females
when one is away and the others form a get-together, the away friend CAN NOT be replaced. This goes against the jega code.

the other members of the big group are usually jelous because they are not apart of the jega group.

There is only one jega group within each group
"i wish i was a part of the jega"

or

"can i be a jega" "no, we're full"
by gi-jo&al-ed August 17, 2010
 
2.
Someone who cannot meet up to a promise or effect a plan.
Someone who is full of disappointment.
Ariyo cannot be saddled with the responsibility of organizing the event, he is a real jega.
by T.Ariyo from nigeria. April 03, 2011