The Virus your PC gets when you go to too many unsafe porn sites.
My Brother was surfing the net last night, now the hard drives full of ESTD's and there's little hairs in the keyboard. Grody.
Acronym for "Easier said than done". In other words, the task at hand is easy to discuss but would be far more difficult to actually accomplish.
<Pinky> Let's take over the world, Brain!
<Brain> ESTD, Pinky...