What is D-mail?
1.
Short for Desk Mail
When you write something on a desk for someone else to read later. Could be intentionally, for example writing a message to someone who sits in the same desk later in the day or unintentional, for example having someone forget to erase the answers for the test that they wrote on the desk or writing random crap on the desk.
Beanerous Brokus I: Holy crap I forgot to tell them I'm not going today. I'll just send em a d-mail
or
Beanerous Brokus I: Thank god I received that D-mail, I nearly failed the test.
or
Beanerous Brokus I: Look at this D-mail I got, it says "You suck"
See
2.
The technical IT term for going for a dump.
Snedwan - how's it going? What have you been up to?
Boss Hogg - Gotta run dude, I need to send a d-mail.
See