Sympathetic Accent Syndrome (SAS) 

When you adapt your speech patterns, word choice and/or accent to your surroundings.

Possible influences include tv, movies, peers, country of location and random people on the street.

Watching America comedy has given me hectic Sympathetic Accent Syndrome (SAS)! My mum thinks I sound very unrefined..

Sympathetic Accent Syndrome (SAS) by HellHathNoWroth September 27, 2017

sudden accent syndrome 

when someone you're talking to changes accent or dialect for no apparent reason a.k.a SAS

guy: Hola, it's me! como estas?

girl: Um, i thought you were French??

guy: uhm Oui! Bonjour...

girl: wow. you have sudden accent syndrome. what a loser.

sudden accent syndrome by BDTn August 18, 2012

foreign accent syndrome 

a condition in which a person unwittingly speaks his/her language with a foreign accent, usually due to a disease such as migraine and stroke.

After recovering from a stroke, the Englishman began talking with an Irish accent. It is a case of foreign accent syndrome.

foreign accent syndrome by uttam maharjan September 17, 2010

F.A.S. (fake accent syndrome) 

When "Asian" telecallers start speaking with a fake American accent after being on the job for a week. Usually done when they're meeting people for the first time; it usually disappears in a half hour or so because they can't escape the urge to talk normally again.

She was a pretty girl with a hot personality but when her F.A.S. (fake accent syndrome) kicks in she is so YUCK !!

F.A.S. (fake accent syndrome) by wangqiu May 18, 2014