Sandy, well, I'm sure you're right & it usually does mean that. On the other hand such as "False Lover Won Back" & "Trooper & the Maid" both have similar lines and those are clearly meant simply to be ironic for 'never.' Without some sleeping-with-the-fishes lines, I'm not sure what the singer may mean by it. It's a reason, I think why "Grey Cock" can work well as a ghost or night-visiting or comic or love song. Does a lot of duty.