"She was the champion woman pisser of Ireland and married Cuchulain and that's why to this day she is called Great Bladdered Emer"
Emer rebukes Cuchulainn
Public DomainEmer rebukes Cuchulainn

Yeats, in his  poem, "Crazy  Jane on the Mountain," refers  to "Great-Bladdered Emer".  It is explained in a footnote that strength and volume of the bladder were considered signs of vigour.