That's what I call it.  Other people may call it something else.
In any case...it is, simply put, the interlacing of new text between the lines of another poster's text.
It's a natural form of Usenet heckling, and I hear it goes as far back as pre-Usenet bulletin boards.

I've placed Wackylacing in the Crossthreads, because it clearly cannot be done alone*.  Most of the Wackylacings you'll find here were culled from the Usenet newsgroup alt.fan.tom-servo.  Some of them are the creation of three or four people, as each person introduces another level in the lace.  Many of these posts contain personal comments that may appear insulting to the original poster; self-deriding "first person" laces are the most fun to create.  For my own part, if you see a lacing with "Captain Infinity" in the "From:" header, insults are included for cheap humor purposes only.  True flames are too easy to write to waste energy by including them in a difficult wackylace.

*except if you are wackylacing a post written by one of your alternate personalities, as I did here.

And now, a special feature: Wackylaces by Lori, 80's Child

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