1785 - A Classical Dictionary of the Vulgar Tongue, Francis Grose;
"GENTLEMAN OF THREE OUTS, i.e. one without money, without wit, and without manners"
From: La Belle Assemblée:
Or, Bell's Court and Fashionable Magazine
Volume XXI - New Series. From January 1 to January 30, 1820
La Belle Assemblée for August 1820
A Tour Round London and its Environs