A way of emphasising one's keenness to partake in an activity- often surfing, drinking or fighting. Often shortened to mad dog. Mad dog keen is a phrase made popular by the cult underground movie "Jordanman 2.0"
Dr Pain: "Wait...lets make this interesting. keen?" Jordanman: "Yeah....Mad dog!" Mayonazi: "Wanna get crunk as?" Everyone: "fuck yeah, mad dog keen!"
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