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1.
A very fat ballerina (suposively looking like a barrel). A derogatory term.

*Note, there's also a city in Brazil bearing that name.
The obese girl loved theatre, ballet and such, but she knew she could not participate: who wants to see a barrelina thumping on stage?
 
2.
A derrogative term for a very unfit ballerina (pointing out at her barrel-shaped body).
Jane always admired ballet, but she knew that her obesity would only enable her to become a barrelina.
by Ace of spades aka raisin in flames September 03, 2007