What is Shoulder-deep?
1.
A state of being where one is immersed extraordinarily deeply into a project or situation.
Originating from farm life, where cattle and horse breeding often requires literally going "shoulder-deep" into an animal to either fertilize its eggs manually or to check for a pregnancy. This is only gross the first dozen times. Ask your veterinarian or local 
Man, I have to
get my nerd on and start coding this back end content managed system of this web site my damn self. I'll be shoulder-deep in figuring it out.
See 
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1. 
In its simplest form, rape. 
Applies more directly to taking advantage of young, drunk/unconcious/helpless/often ugly, traveling girls .. 
1. 
When someone has had braces on their top teeth and the top ones are fixed but their bottom teeth are still screwed up.(teeth resembling ..