The act of sending an email with a highly inappropriate subject line to a friend as a prank. Typically this is done in jest in hopes of causing mild to moderate panic for the recipient at his or her workplace. When composed correctly, the email-- which is always sent to the recipient's work email address --should contain key words or phrases that would alert the IT department to the inappropriate subject matter. Topics may include, but are not limited to:

-Sex with Hookers or co-workers (preferably at work)
-The recipient's full-on addiction to cocaine
-A response to a prior email about the bosses micro penis
-Anything related to a Chris Hanson/Dateline NBC investigation on his/her usage of internet chat rooms
Dude 1: "I cannot believe Bryan got fired yesterday!"

Dude 2: "Seriously?! You 'Subject Lined' him with the "RE: Your Rubbermaid Chin Dildo order is confirmed" ...How did you see that one playing out?"

Dude 1: "...People who work at churches really need to lighten up."
by Mopper February 6, 2011
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Using email to text message by composing the email entirely in the subject line thereby bypassing the body of the email.
Dude Mike is always subject line emailing me and never responds to my replies since he is too cool to use the body of an email. Why doesn't he just text me?
by unklephester May 27, 2011
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