a nickname for girls named Jennifer and/or Jessica who are constantly compared to one another, say the same thing at the same time, work together, borrow each others' clothes, like the same movies, and laugh at each others' jokes when no one else thinks they are funny. They are essentially one person, so they are called "jennica"... it sounds nicer than "Jessifer".
"Which one of you is Jessica and which one is Jennifer?"
"We are Jennica, if that makes it easier to remember."
an outgoing, funny girl, who gives more than she takes and never complains. Always has a smile on her face. Usually has big tits and and awesome ass. Willing to go the extra mile to make her lover in bed happy, but expects it back!
When a female is often regarded to be a strong willed person who has a natural knack of bringing people close together. A strong affinity for cameras, photography and food are also qualities found in many, "Jennica's"
The term itself is not to be used lightly as it it is often regarded as the, 'highest' of praises.
Wow this party turned out great! Who set it up? Clearly it was the Jennica of the bunch.