To do the number two...bathroom-wise
"Man burritos always makes me have to build a bear, a big fucking bear."
When you're lying on the couch in an awkward and uncomfortable position but you can't be bothered turning over.
Origin: The word comes from the swedish word 'skinka' (meaning ham). Ham is slaughtered pig, and being slaughtered can't be very comfortable at all.
-"Man, my back hurts"
-"I spent the whole evening shinking in front of the TV, I think my spine is twisted"