a herd of whales
"The ship's captain watched anxiously as the entire gam of humpback whales breached in unison along the horizon."
A person's leg, especially an attractive woman's leg.
"The whale watchers spotted a large gam of humpbacks breaching together in the calm bay waters."
Collective noun used to refer to a group of whales, or rarely also of porpoises; a pod.
To pay a social visit on another ship at sea.
"The captain invited us to gam their vessel later that afternoon so we could share stories of our respective voyages."