- The wrinkly, concave part of one's arm opposite the elbow. (From my friend Cameron and supposedly originating in Lancaster, CA.)Addendum. My brother Greg was reading a book in which he happened upon the real name of the krelbow: anticubital fossa. Anticubital pretty much just means opposite the elbow but I don't know what the hell a fossa is.
Ow. I slept funny on my arm and now my krelbow hurts.
Dictionary of american slang with examples. .