I am told that it plays on a slang phrase then current, "to make a gazebo of yourself," meaning"to make a spectacle of yourself and a fool of yourself, publicly."

有人告诉我这是当时的说法,建筑楼台意思是“,当众出丑,大庭广众下出洋相“

耶鲁公开课 - 现代诗歌课程节选

This is when the addition gets very publically awkward so.

这时候还在做加法计算,当众出丑了吧。

哈佛公开课 - 计算机科学课程节选