I heard both versions of this as well. Or rather, I heard the second,
and was surprised to see the first in the manual.
Quoting Dave Horsfall <dave(a)horsfall.org>:
Speaking of things etymological, I've heard two
versions of that for
dsw(1).
Delete from Switch Register (delete file whose i-num is in CSR)
Delete Sh*t Work (same, but expressed a bit more robustly)