Used in Derry as a greeting that goes beyond a simple hello. When you say "yes" to someone in Derry it really means "well my good friend, it's most excellent to see you and I hope you are doing well and achieve all you undertake."
It can be used to start a large and varied conversation, although has been known to be a conversation on it's own:
Person 1: "Yes!"
Person 2: "Yes."
*end of conversation*
"Yes" is very handy to use if you don't have time to talk to someone, for example if you are in a hurry to get somewhere but pass an old friend along the way. By exchanging "yes's" in a couple of seconds it is as effective as stopping for a cup to coffee and a chat about good times.
A word of warning, if you use "yes" as a greeting outside of Derry, you will generally be given funny looks...
It can be used to start a large and varied conversation, although has been known to be a conversation on it's own:
Person 1: "Yes!"
Person 2: "Yes."
*end of conversation*
"Yes" is very handy to use if you don't have time to talk to someone, for example if you are in a hurry to get somewhere but pass an old friend along the way. By exchanging "yes's" in a couple of seconds it is as effective as stopping for a cup to coffee and a chat about good times.
A word of warning, if you use "yes" as a greeting outside of Derry, you will generally be given funny looks...
by notayesman October 17, 2008
Get the yesmug. by Oeama February 20, 2020
Get the Yesmug. 
by Itzzzzgarei! April 26, 2017
Get the Yesmug. 