adj. Often found in arrest reports and love letters that are also nyah-nyah-ish.
Real citation: "I don't even know what I should feel, must I feel an I-told-you-so-esque feeling? To be honest, I don't."
(June 24, 2008, http://veritaserumplease.blogspot.com/2008_06_01_archive.html)
Made-up citation: "I hate to be all I-told-you-so-esque, but there's a reason my variation of the atomic wedgie is feared up and down the eastern seaboard. Now you know, Dr. Vargas! Now you know."