noun.
Vulgar, lewdly humorous language or joking or an instance of it.
The Century Dictionary and Cyclopedia
noun.
The qualities or acts of a ribald; licentious or foul language; ribald conversation; obscenity; indecency.
the GNU version of the Collaborative International Dictionary of English
noun.
The talk of a ribald; low, vulgar language; indecency; obscenity; lewdness; -- now chiefly applied to indecent language, but formerly, as by Chaucer, also to indecent acts or conduct.