look up any word, like swoll:
 
1.
The step sister of your half sibling, OR the half sister of your step sibling.
MIKE: Okay, Honey, this is my skip sister Elaine.

HONEY: I think I am pretty good at this now! Elaine is the half sister of your step sister Sharon, right?

MIKE: Right!
by Shelly Bozdog June 30, 2006