Arriss translates to bottom (arse) via a quite circuitous route, so here we go....
Arris is an abbreviation of aristotle.
Bottle (and glass) = arse.
Now to use in a sentence:
"I used to work with an ice cream who wouldn't do 'owt until he got a kick up the arriss" which translates to "A former gentleman colleague was so lazy he never did any work until he got a boot up the jacksie"