AtD translation: stood there as if professionally sapped

[Mike Jing]

P86.29-38   “Brother, we are stripes and solids on the pool table of
earthly existence,” the Rev explained, “and God and his angels are the
sharpers who keep us ever in motion.” Instead of dismissing this for the
offhanded preacherly drivel it almost certainly was, Webb, in what you’d
have to call a state of heightened receptivity, stood there as if
professionally sapped for another quarter of an hour after the Rev had
moved on, ignored by the pernicious bustle of Myers Street, and the
following Sunday could be observed in the back room of the faro
establishment where Reverend Gatlin preached his ministry, listening as if
much, maybe all, depended on it, to the sermon, . . .

What does "sapped" mean here?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://waste.org/pipermail/pynchon-l/attachments/20180119/5cdc4606/attachment.html>