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1.
1) to have the ability to tell if a girl is fat even if she is wearing baggy clothing.

2) estimating the amount of rolls a girl has even thought she has conservative clothing. (ie. sweatshirt, sweatpants)
Guy 1: Hey check out that chick over there man! She is kinda cute!

Guy 2: No man she's a fatty. I have my X-roll vision active.
by Trent1080 February 11, 2012