A Worm, Trojan, Malware or other noxious item that infects your computer and causes it to possibly become inoperable (and thus need cleaning/reloading).
Oh, Lord, now you know why I don't open attachments from people I don't know or get stuff from random sites. All those ITDs you can get.
By Ruthi
ITD
An instance of short term depression, generally happens after one finds an immense attraction towards another human being. Usually only lasts 2-10 minutes.
ITD- When a girl walks towards one, and upon leaving the subject says, "Alas" (in their head and in other words).