Term is frowned upon within modern safety critical communications. Example being - shunter to driver "the signalman will give you the dummy in a minute" meaning the signal man will clear signal no. (XYZ) in a minute thus allowing the train to proceed.
by Clansman April 22, 2009
Get the dummymug. by Pap fan November 5, 2007
Get the dummiesmug. by CLMKerr December 21, 2008
Get the dumminessmug. 
A cheat in Halo 2 that exploits the Xbox Live network code to make a player invisible and invulnerable, allowing him to capture a flag in 15 to 20 seconds. It involves getting in and out of the passenger side of a Warthog repeatedly, then having a partner drive it to the base, at which point you take the flag, then take one step, which teleports you back to your base for the cap.
On a side note, Bungie has made dummying a bannable offense.
On a side note, Bungie has made dummying a bannable offense.
by Seer-of-Shadows February 20, 2005
Get the dummyingmug. by StupidIdoitDummy March 29, 2017
Get the dummymug.