Verb~ The act of masturbating until the point of climax with the penis between your legs and pointed backwards. Upon climax, one releases said penis, causing a "trebuchet" like motion and fires the ejaculate onto ones own face.
Brad: what did you do last night buddy?
Carl: I watched some SOA and then performed the
Danish trebuchet before lights out.
Brad: Oh my god, did you vomit?
Carl: yes.