This term really belongs to recursion theory (and other very theoretical analyses of computable functions). A function which enters an infinite loop for some input is said to be undefined for that input. Since it is sometimes convenient to consider the function to "compute" the value _|_ (aka bot or eet), it's handy to say that it halts, only it doesn't. Hence "dynamic halt".

But I've heard the term used facetiously far more than I've heard it used seriously; draw your own conclusions...