Having been at quite a few of the recordings of Round the Horne as a lad , dad worked for the BBC & I got lots of tickets for recordings.
At that time these "polari" words went over my head.
As I grew older & more worldly wise with friends of various beliefs & persuasions I was given to understand that in "polari" "trolling" could mean walking around looking for "company" I think a look at the included "Polari" slang will be of interest to some...
http://chris-d.net/polari/
Cheers, checked it out, now I understand........