2 definitions by Basskadet
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.
by Basskadet June 22, 2019
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.”
“Just follow him, he knows the koo.”
by Basskadet June 2, 2019