Definition of "john"

The girls sat there while the johns (customers) moped around giving them the once-over.

1946, Mezz Mezzrow, Bernard Wolfe, Really the Blues, New York: Random House, page 22

In the first part of the video, Thad sucks the john's cock and takes a load in his mouth.

2004, Dennis Cooper, The Sluts, page 233

In-calls, where the john comes to the prostitute’s residence, are prohibited.

2013, McLachlin CJ, Canada (Attorney General) v. Bedford (2013 SCC 72), para. 62