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1.
Nervosa has no real definition in the English language. In Latin, it means "nervous".

For contextual purposes, it means "the psychological addiction to a behavior, belief, or habit" that effects the body via the nervous system, or the mind.

It is also a word commonly used in reference to botany. Nervosa, when used in botany, describes a trunk or tree like pattern of veins within the leaves.
Mary Sue has fallen prey to Anorexia Nervosa?

Psychotria Nervosa has beautiful, bright green leaves.
by l2isen August 22, 2011
 
2.
When an emo person decides to call themself something.
emo screename = CelseteNervosa
by xDxUxZx August 19, 2006