Definition of "fanboyish"

Admittedly the scenario that it was an unholy alliance of numerous enemies of the Doctor and other alien races that had united to create the trap was rather fanboyish on Moffat's part, even though it was great to see them assembled together like that and showed just what a threat the universe was facing once such an alliance had been created.

2010 June 18, “Doctor Who: The Pandorica Opens”, in Telegraph

"Oughta be more careful, El. Most people aren't accustomed to fanboyish squees." "Well, they aren't going to get used to it without exposure." "Fair 'nough."

2013 June 3, Dan Shive, El Goonish Shive (webcomic), Comic for Monday, Jun 3, 2013