Telling someone to "eat a dick" in sensitive situations where profanity is not tolerated. You take the first letter of each word and translate it using the military alphabet. Used in radio transmissions, which are monitored, thereby conveying your message without subjecting yourself to discipline.
Sgt. Brian: "Ofc. Mike did you complete the last assignment I gave you?"
Ofc. Mike: "10-4 Sarge, and that's a big Echo Alpha Delta."