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1.
being in a situation, especially one of a social nature, that is difficult and seemingly impossible to get out of.
Holly: "Damn, this party is lame. I so wanna leave here like right now, but I don't wanna be rude to Kristin either, she's still a great friend. Ugghhhh.... I just KNEW we should have planned an exit strategy, huh?"

Jenn: "For sure, especially since the bash that Terri's having would be WAY more off the chimney no doubt. It sure sucks to be land-locked like this!"
by Holly August 14, 2006
 
2.
Being unable to move for fear of someone seeing your erection
Hey Randy, want to go get some cheeseburgers?

I'm pretty land-locked right now, give me about 5 minutes.
by Melvin the Window Licker March 08, 2014
 
3.
Making a poo so large that it heaps up out of the water in a mound on the bottom of toilet bowl causing difficulty in flushing and "racing stripes" on the porcelain.
After eating at the Mexican place last night i got totally landlocked this morning, so much i had to use a plunger to unclog!
by deacon4100 October 21, 2010