Definition of sea lions:
(n) :
A marine mammal of most genera in the family Otariidae (the eared seals).
(n) :
(heraldry) A monster consisting of the upper part of a lion combined with the tail of a fish (a lion marined).
(n) :
(US, slang, historical) A steamer transporting cattle from the ports of Texas.
(n) :
(US, slang, historical) A cow or bull transported by steamer from the ports of Texas.
(v) :
(rare) Alternative form of sealion (“engage in disingenuous debate”). [(Internet slang, derogatory) To intrude on a conversation with probing questions in an attempt to engage in unwanted debate, usually disingenuously as a form of harassment or trolling.]