Defining a vskip that possibly becomes vfill

Question

I hope this is not a duplicate; I tried to search around and didn't find anything, but perhaps I used the wrong keywords. I'm using Plain TeX and have the following defined:

\newskip\hugeskipamount
\hugeskipamount=24pt plus 8pt minus 8pt
\def\hugeskip{\vskip\hugeskipamount}

This is all fine and well, however sometimes when I have

A
\hugeskip
B

and B starts a new page, the vskip disappears at the bottom of the page, and the page becomes all streched out, giving an underfull vbox. Is there a way to define hugeskip in such a way that if it turns up at the end of a page, it just functions like a vfill, i.e., there'll be a bit of a gap at the end of the page (which I find better than increased gaps between paragraphs). Thanks!

Answer 1

Your question would have been clearer with an example but if I understand correctly

\def\hugeskip{\vskip\hugeskipamount\filbreak}

\filbreak is plain macro \vfil\penalty-200\vfilneg so normally it does nothing but if a page break happens at the penalty you get vfil at the bottom of the page, the \vfilneg is discarded before the next page starts.