sealion /ˈsiːlaɪən/noun 1verb 1forms 3 noun1 •(Internet, disapproving) One who engages in sealioning.Randi's list is a key reason I've been able to continue to use Twitter, as it prevents relentless ideological sealions from crowding my mentions. — 2014 verb1 •(Internet, disapproving) 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.There, Peggy speaks for every angry marginalised person who’s ever been sealioned or tone-policed in a disagreement. — 2015 formssealioned · sealioning · sealions