A phrase used to ascertain information from a rival as to what happened to him during an altercation, sometimes said information can be used in reports. Most of which are due the following day. In most cases no information is passed on because the fallen rival neither has the strength to tell you due to his/hers incapacitation after the conflict, nor has the intestinal fortitude.
Tell me is often followed by words such as "who", "where", "how" and "what". Furthermore, it can be lengthened to "tell me what happened" or "tell me who emerged victorious". The latter phrase is usually abbreviated to simply "who".
*after a physical conflict*
PersonA: Tell me what happened!
PersonA: aww you never tell me but.