That funny little tickly feeling one gets in the pit of their stomach while visualizing Orlando Bloom's face and/or body. Experienced by fangirls worldwide on a regular basis.
Girl: I have to give a speech and I'm really nervous... My stomach hurts.
Boy: That is called the Bloom Effect, my dear.
Boy: That is called the Bloom Effect, my dear.
by CoriOreo January 26, 2008