The process of having intercourse while the female partner has a moderate fever. Preferably coming down from the flu when extra mucus output begins. Typically performed by couples, the male should not have a fever, thus giving him the extra sensations of a super-heated extra-slimy pussy.
Unless the fever is over 100°F it's not considered 'hot clam'. A fever of 103+ is extremely mood-inhibiting thus only achievable by master hot clammers. Therefore optimal temperatures will be between 100-102°F ~ 37-39°C.