In cricket, sledging is exchanging words with an opposition player which can put them off their usual game; it is an attempt to "psych out" an opponent. It can lead to an unexpected decline in performance and is not in the spirit of the game.
Instances of sledging
2003 - Australian fast bowler Glenn McGrath exchanged words with West Indian batsman Ramnaresh Sarwan. According to a report, McGrath was alleged to have said "If you ever f###ing mention my wife again, I will f###ing rip your f###ing throat out."
2004 - Australian leg-spinner Shane Warne was alleged to have called Ronnie Irani's mother a "whore".
The Age - Warne Sledge (http://www.theage.com.au/articles/2004/08/06/1091732055253.html?from=storylhs&oneclick=true)
Sledging part of Latham's cricket days (http://www.theage.com.au/articles/2004/01/04/1073151212472.html?from=storyrhs&oneclick=true) Requires registration