His conversation was full of lavatorial humor that made people uncomfortable.

lavatorial 是由名词 lavatory（厕所）加上形容词后缀 -al 构成的形容词。lavatory 来自拉丁语 lavare（洗），原指"盥洗室"，现在多指"厕所"。 lavatorial humor 指以厕所、排泄等不雅话题为内容的低俗幽默，俗称"厕所笑话"。