Definitions by Basskadet

Barny 

Cockney rhyming slang for "Trouble" - Barny Rubble = Trouble. However, its usually used to denote trouble/bother in more general terms, such as an argument or a fight.

He insulted my Missus and so we got into a right Barny.

Barny by Basskadet June 22, 2019

Koo 

Essentially means being wise to something, “in the know”, and generally understanding how things work. To “know the koo” is the same as to “know the score” in a situation. You can use it as “knowing the koo” or as being “koo’d up”. So, in London you might hear something like:

“You shouldn’t say stuff like that around here! You need to be more koo’d up!”

“Just follow him, he knows the koo.”

Koo by Basskadet June 2, 2019