When you stick your finger in your belly button or another persons belly button and thrust in and out.

dirty pretty things is the name of carl barat, of thelibertines, new band. the line up is:
-carl barat - vocals & guitar
-anthony rossomando - vocals & guitar (formerly of the damn personals)
-didz hammond - bass (formerly of cooper temple clause)
-gary powell - drums (libertines drummer)