I have never heard this term before, but I often refer to my husband as “my shadow.” Drives me nuts also. But I think he does it because he can’t decide on his own what to do, and also just because he likes to be with me. At ALL times. So you have my total sympathy. It gets really frustrating. But, if I tell him to go sit in the living room and listen to music or “read,” he’ll do it, so I guess I am lucky so far. This is a really hard job. Hang in there.