I don't want to appear as if am against the ,"GEMA/Mt.kenya" notion or family but with all due respect let me answer Robina now after almost 2 years when she asked me why I referred to Kikuyu as "Ariimiti"
Robina come out from the cave you been hiding and finally your answer is here.
Ariimiti is a derogatory word Merus refers to Kikuyus. Simply, the verb Arii means eaters, Miti means tree,so simply kikuyus to Merus are just tree eaters,this comes from the 1800 century. To Merus they used to despise Kikuyus soo much because when kikuyus settled on an area with trees and forest the first thing Kikuyus did was cut down the trees. This was outright against Meru culture that values in planting trees. Merus are prolific tree planters this is widely documented even before pre colonial era, and thats why even Meru towns are very forested Meru town is an example amongst all.
To show you how trees are intertwined with Meru culture. My own family as set aside several acres just for planting trees. To us Merus trees are part of our culture.