Somebody who lies about being more knowledgeable about something because they saw you talking about it. Usually by one upping you as a fan of an something. Short for Sophomaniacal Poser.
Person 1: hey look at this cool video about something I like
Person 2: oh yeah I saw that like a year ago.
Person 1: I literally introduced this to you like 2 months ago stop being a Sophoser.
Person 2: oh yeah I saw that like a year ago.
Person 1: I literally introduced this to you like 2 months ago stop being a Sophoser.
by Imma be honest I made this up November 17, 2020