When an attractive person makes direct eye contact with you and just freeze there staring and smiling; making eye contact with an attractive person and you just freeze in place blushing/smiling.
Dude, I saw this girl at the coffee shop earlier and she totes had the Medusa Effect.
This girl got me weak yo! She definitely had the Medusa Effect down!
(n.)1. a system widely used in Europe to keep certain substances from touching the ground, floor, etc... As of 2009, has not crossed the pond to the United States.
(n.)2. a device able to modulate at low levels consisting of plastic (static free), paper like products (including post-it notes, legal paper, computer paper etc...) in a box or circular form. Used mainly to keep long, flowing objects in place (garland, tinsel, etc...).
1). Five different Italian families are believed to have invented the system know as the "modulator valve."
2.) "Wow", said Jane, "that modulator valve keeps the tinsel from hanging down and tree looks so much more beautiful."