The cough, necessary or not, made by a bathroom stall dweller, alerting outsiders that the stall is in use.
With the stall lock broken, Brad felt the need to give a courtesy cough, just in case someone felt the need to intrude on his private poop area.
av TheSein 13 september 2011
When someone's cell phone goes off in a classroom and everyone in that area coughs to cover it up. Normally used by students at up-tight high schools.
Megan's phone started goin off in English so we all gave her a courtesy cough so that the teacher wouldn't hear it.
av scottie does know 16 december 2005