piss alias

BUR #50713 has been approved by @evazion.

create alias piss -> pee
create alias pissing -> peeing

like butt -> ass but in reverse

piss wiki page already exists for some reason.

I expected this to be a former alias that had been removed, but this is the first time the tag has been included in a BUR.

The bulk update request #50713 (forum #398597) has been approved by @evazion.