The most necessary article of clothing when attending a movie. The flannel is then used to conceal any vulgar activities done underneath it. Therefore, one is courteous by using this article of clothing. Used as a prefix, courtesy can be applied to many other terms (courtesy pontoon, courtesy car, etc). Courtesy can also be used as a verb.
A courtesy flannel may be too straightforward on the first date.
“Wow, did they really courtesy on the pontoon boat? Classy.”
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