ESD - publicly acceptable shorthand for the sentence, "Eat shit and die." Commonly followed by a proper noun of address. Typically used in situations where the word shit is not allowed to be used, or where the available number of display characters is limited, e.g. license plates and public signs.
Mr. Jones, I want you to go into the lounge of the common area at Walton Hall tonight and write on the chalkboard, "ESDW. XOXO, H."