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The Person you want to spend the rest of your life with, your soulmate.
From a Pon and Zi commic:

"Did you know that when a penguin finds his/her soulmate, they stay together for the rest of their lives?"

"...Will you be My Penguin?"
by ChaoticallyJo March 05, 2009
A select few of your closet girls that are your best friends aka my penguins.
Do you know Andrea and Kirsty?
They are My Penguins!!
by nonny1506 May 23, 2011