Seddie is a name combined from two other names called Sam and Freddie, who are on the show iCarly. They bicker constantly, but they might have a love/hate relationship in the future iCarly episodes.
Freddie says, "You know, if a girl rips on a guy, it usually means she has a crush on him." Sam says, "Yeah, but i wasen't ripping on a guy, i was ripping on you. Such a seddie moment.