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1.
Seems to stem from the combination of the words cram, crack, or crease and wedge.

Noun: A narrow opening. Often used to describe areas of the body where there is skin-to-skin contact.

Verb: To slip an object in to a tight space or to otherwise form a bond with to objects (such as the spoon cuddling position)
Noun: Obese men have a lot of trouble keeping the credge between their overlapping belly and pelvis clean.

Verb: I couldn't sleep last night; my dog kept on trying to credge up under my ribcage.
by Steve Stocker October 12, 2004