I found no definitions of that word.. I assume it is a Kenyan local slang. I think it can be broken down in to the two main parts. Slob...as in “They are slobs. and Bovines... as in pigs.. Then I figured out you meant “in English” that they were Pig Slobs.
I like that!
First coined by L’il Abner cartoonist Al Capp, Lower Slobbovia crept into the American lexicon——it refers to an imaginary nation, connoting a place which is underdeveloped, socially backward, remote, impoverished or unenlightened. ....and the citizens therof.