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2.
A pretty awesome hairstyle with girls that was popular in the late 1960s and again in the mid 1980s, but side-ponytails were really more popular in the 60s than the 80s. I can see side-ponytails coming back in style around 2009.
Sarah is wearing a side-ponytail. That's hot.
by Lil Duff 2008 December 06, 2008
 
1.
1. A hairstyle popularized by 1980's American girls to try and look like Madonna. It was usually combined with a stretch pants/skirt combination and jelly slippers.

2. Most recently popularized in the 2004 film, Napoleon Dynamite, where the title character's love interest wears a side-ponytail.
Check out the ponytail holder holding up my side-ponytail, its magenta, white and black, just like the laces on my LA Gears.
by Nikki4mets August 23, 2006
 
3.
Having hair sticking out of the side of your head, leaving you looking like you're mentally challenged.
A side-ponytail is gay and looks like a girl who forgot to make a second pigtail.
by Anonymous January 21, 2005
 
4.
Makes girls more than ugly.
A side-ponytail is a turn-off, maybe not for lesbians though.
by Every Male Alive February 02, 2005