I really don't know if this would have any connection to the meaning of the word gig but it could possibly provide some connection between the frog/fish gigging and the musical gig. There have been times when we have played for money in a fish bowl. The band usually has to provide their own fish bowl on these occasions. It usually helps to put a few bucks in the fish bowl so the audiance gets the idea and/or their attention. ~~ In ice fishing, jigging means to bounce the bait up and down to get the attention of the fish. If you see any sexual connection here it's your idea not mine....

Cap't Bob