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French word pissoir comes from French pisser, French -oir
pisser (French)
(ambitransitive, slang) to piss. (transitive) to pour with (some liquid).
-oir (French)
A suffix forming infinitives of many verbs. A suffix used on verbs to form masculine words for objects or tools used to do something.. A suffix used on verbs to form masculine words for places where something is done.
pissoir (French)
(slang) bog, john.