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An adventure of extreme nature, can be applied to any adventure whereby a normal person would consider you to be mad for partaking in the said activity. ie An adventure such Mountain Biking in the pouring rain at 4 in the morning
Brendan: The ride got a bit insane back there when it stated pouring down and that fox was chasing us.

Steff: It did indeed, it was a bit of a Madventure
by www.madventure-wales.co.uk September 02, 2009
a kickass tv show from finland where two guys travel arround the world doing all kind of stuff
tunna and riku kick ass!!!!
by jussi April 09, 2005