Their entry for “busy” is the following:
O.E. bisig “careful, anxious, busy, occupied,” cognate with O.Du. bezich, Low Ger. besig; no known connection with any other Germanic or Indo-European language. Still pronounced as in M.E., but for some unclear reason the spelling shifted to -u- in 15c. The word was a euphemism for “sexually active” in 17c. Of telephone lines, 1893. In M.E., sometimes with a sense of “prying, meddlesome,” preserved in busybody. Busy work is first recorded 1910. The verb is O.E. bisgian.
The last time I had any whoopy appears to have been in the 17th century!
Note: Online sex in 1893????
If you combine this notion with the explanation for “busybody”, I’m definitely buggered… Btw, I am NOT bisgian!