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1.
1. When a girl takes one hand and puts it between her legs from the front and takes the other hand and puts it between her legs from the back and then proceeds to masterbate.

2. A man, or another woman, can also do this same procedure as a form of foreplay.
My buddy and I took home a chic from The Lodge and were land-locking her all night.
by FILTH78 July 19, 2010
 
2.
Someone who grew up around the ocean, goes to a region surrounded by land or far from the ocean.
I went to Ohio to visit my family, after a week landlock set in and wanted to be back in California.
by Heyitsyou August 16, 2009