pissing

pissiminen (present participle of)
puhekieltä An act of urination.
2007, McDago Kraut, Betwixt the Shit & Bliss, There Lies Pabusa Within (page 176)

(..) the house reeked of her mother's territorial pissings; I couldn't even take a piss in my own fucking bathroom without smelling the offensive stench of this possible mother-in-law (..)