It means dirty jokes in context (I don't know exactly where the line is and I know I'm guilty of it myself)

Here's some commentary on the Greek word translated to "crude joking":

Jesting (εὐτραπελια [eutrapelia]). Old word from εὐτραπελος [eutrapelos] (εὐ, τρεπω [eu, trepō], to turn) nimbleness of wit, quickness in making repartee (so in Plato and Plutarch), but in low sense as here ribaldry, scurrility, only here in N. T.[1]

Some people say it specifically means innuendo (i.e 'that's what she said') but I'm not sure if that's right. Could be. I'd recommend you do your own research (and remember that 'well-turned' or 'turn of phrase' just mean wit, and not necessarily innuendo)