Clanga is the sound that is made by the cowbells rung by fans of the Mississippi Statefootball fans. Also used to disparagingly describe Mississippi State football fans.
That thing the Youtuber stevecash83 always says at the end of a video description. We don't know what it means, and we'll never know as stevecash83 is dead.
stevecash83: So Sylvester did this thing and yadda yadda yadda. Flaggle Claggle.
fans: what the fuck does flaggle claggle mean, you've been saying it since 2010, we should know now.
stevecash83: ...