The subtle female bouquet - reminiscent of fish - resulting from an excess of old vaginal mucus. Sometimes found on ladies bicycle saddles in hot weather Shufti
'Well Rupert; from the delightful aroma from the kitchen, I thought we were having fish for supper.'
'No, Claude: it's pheasant old boy. What you can smell is Lady Constance's whang. Quite mackerelly today, don't ya think?'