Siddons 

An uptight, usually condescending person. Often can be overally critical and pretentious in conversation with others. Tastes are based around what makes them appear smarter, so that they have grounds to mock your interests.

"We were going to go to the mall last night but Rob was being a Siddons and kept complaining."

Siddons by Ian Malone September 29, 2005

Siddong 

Guyanese slang meaning sit down

You siddong and aile meaning sit down & oil

Siddong by Caramelqt36 February 24, 2019