Choka word

Hi!
I found the word "choka" on surfing-waves, tried to do a little research on it and... got stucked
Only couple of records found after googling it for couple of hours...I contacted some surfing schools in California and none of them have ever heard the word.
Have you heard it beeing actually used on the beach? Do you maybe know its origins? How come the word's so rare / difficult to find on the internet - is it old school or simply rarely used?
I would be very grateful for any information or tips where to look for it!
Joana
I found the word "choka" on surfing-waves, tried to do a little research on it and... got stucked

Have you heard it beeing actually used on the beach? Do you maybe know its origins? How come the word's so rare / difficult to find on the internet - is it old school or simply rarely used?
I would be very grateful for any information or tips where to look for it!
Joana