Birkenrock 

1. Originally meant to refer to the type of pop-folk music one might hear from artists and bands that would play at Lilith Fair, i.e. mostly acoustic music with supposedly deep meanings. So named because fans of this style of music were known to be passionate about wearing Birkenstock shoes in the late 90's when Birkenrock was the genre du jour.

2. Now, the word is expanded to also include slightly more testosterone-laden acts (but only slightly). In addition to the Lilith acts, acoustic male acts that a little bit too positive to be emo are Birkenrock.

Angela owns every Indigo Girls bootleg ever made. She's really into that Birkenrock.

Birkenrock by Golfhaus January 9, 2005

Birkenstocker 

A creepy hippy that stalks people.

A: Did you pick up your vitamins at the health food store?
B: I tried but there was a 'Birkenstocker' following me down every aisle and I had to ditch him.

Birkenstocker by Bryan Gilbreath October 17, 2010

Birkenstocks on the ground 

The presence of the popular sandal at an event or gathering. The preferred footwear for hippies, lesbians, old people and preppies.

"There were plenty of Birkenstocks on the ground at the Berkeley alumni reunion."

Birkenstocks on the ground by yes juanito yes October 12, 2014

Birkencroc 

A combination of Crocs and Birkenstocks. The most unattractive yet deceptively comfortable footwear imaginable.

These Birkencrocs sure make running from the Fashion Mafia a hell of a lot more comfortable!

Birkencroc by Sgt. Salt February 26, 2011

Birkenstocks 

Sandals worn by liberals, women in Vermont, and for some unknown reason, evangelical youth pastors trying to appeal to young adherents of Christianity.

Pastor Mike has a goatee and wears Birkenstocks--he looks like a pothead for Jesus when in reality his only addictions are online porn and energy drinks.

Birkenstocks by Gary Vitalis February 24, 2007

Birkenmocks

Birkenmocks are any type or brand of fake Birkenstocks. Hence the stem word "mock". Birkenmocks are cheaper than the actual hippie shoes and can often be found on the feet of cheap/broke activists, treehuggers, peacniks, along with many lazy high schoolers. These shoes say "I'm a hippie on a budget".

Mari was too broke for the real thing, so she bought some Birkenmocks from Payless.

Birkenmocks by spiderfrommars June 28, 2009

birkenflock 

a group or gathering of three or more lesbians. The term is a portmanteau of the words "birkenstock" and "flock." Birkenstock refers to the footwear commonly worn by dykes & lesbians.

When we were at Home Depot, there was a huge birkenflock of dykes standing out front near their pickup trucks.

birkenflock by AMtwo November 5, 2010