Give a monkey half a brain - meaning?

[ukcocotte]

Hey everybody !
I would like to know if the expression "give a monkey half a brain' is an idiom, and if so, could someone explain the meaning?
Thanks for help
(sorry if this question has already been asked )

[RonBee]

If it's an English idiom it's new to me. Some context might be helpful.

~R

[curmudgeon]

Its a derogatory remark. For instance, if you experience somthing that someone has been done badly (a piece of work or a task) then you could say 'You see what happens when you give a monkey half a brain' the 'monkey being the person who made the mess. Not very nice