Top definition
It is a relationship between two sister, it is more than a best friend and means more than the word sister. If you have a sister that you are best friends with she is your Best Sister!
My sister Jenna is my Best Sister.
by Jillian Pantalone July 15, 2011
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug