To *enthusiastically* agree with something that was said. Makes more sense in texting or online chatting conversations because it uses two "S"s as opposed to "yes" which uses only one "S." A simple "yes" can sometimes be taken as a stock response from someone who is not actually interested in the conversation.
Brandon: I contend that country music brainwashes our youth. Beth: Yess! I enthusiastically affirm this statement.
Albert: I didnt know Julie could play the piano Fredrick: O Yess, she learnt last year at the Queens gathering.
Albert: O Yess, that was a ball to remember.
Fredrick: Defiently ( Drinks Tea )
