Top definition
A moment when a fan girl either thinks about her obsession, sees her obsession, or have her obsession be mentioned on tv/YouTube
Person 1: Hey, have you seen Cassie today? She's freaking out
Person 2: yeah....she had a fangirl moment when I mentioned Jack........
Person 2: yeah....she had a fangirl moment when I mentioned Jack........
by tagat April 20, 2016