iCarly is a show on Nickelodeon.
Recently, the name “iCarly” has been used on social media to describe people who are always recording or posting everything online.
When a girl (or man/non-binary) has a person simping for them, only to reject them for a period of time and then get upset when their ego booster wants to get into a relationship with someone else who isn't them (despite them showing disinterest in the first place). This is behavior the protagonist of Icarly showcased towards a male character.