A phrase used to politely insinuate the act of sexual intercourse, typically used when there has been large amounts of sex between a couple in a short amount of time.
Not used in any way to portray the mis-use or mis-conduct of the action of fornecation, and is not to be used in a derogative way.
"Mary's boyfriend Dave got back yesterday from a 5 week holiday, and they've been doing an EJ since."

"Wheres Josh and Sarah?"
"I dont know. Probably off doing an EJ."
by imsodeadatlunch April 20, 2010
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