adj. Describes a viewing technique often accompanied by drool and squick.
Real citation: “That's only one corner of the original image. In the part of the picture that's cut out, if I recall correctly, Nall is sitting on the floor. Several of the pictures had both Twisty and Nall in them; if Twisty wasn't giving leertastic stares at Nall, he's giving that thousand-yard stare.”
(May 25, 2007, Portal of Evil Forums, http://friends.portalofevil.com/sp.php?si=3&fi=000011827&ti=1000713912&pi=1000713970)
Made-up citation: “A controversial new study shows men are more leertastic, violent, and male than women.”