L. Van Dusen's definitions
Verb: The action of shaking one's Birkenstock sandal while paused mid-stride to dislodge any small pebbles, sand, mulch or other (usually organic) material.
"Yo, wait a minute, I've got to do the birkenshake!"
by L. Van Dusen February 5, 2012
Get the Birkenshakemug.