The spoken sound to acknowledge failure or a Let Down decision. It is emitted from one's mouth either voluntarily or involuntarily upon receipt of bad news.
Henry: Are you coming on holiday with us?
Steve: I want to, but unfortunately I have no money.
Henry: R.
Steve: I want to, but unfortunately I have no money.
Henry: R.
by pppmmunuay March 26, 2009
Get the Rmug. an abbriviation for the Game Company Rockstar Games who brought into this world wonderful games such as GTA:III and GTA:Vice City
by brian January 20, 2004
Get the R*mug. by NIKKICEEE October 28, 2005
Get the R&Rmug. by uhohspaghettios April 17, 2005
Get the R&Rmug. 

