Giant Bowser robot built by Baby Bowser in "Super Mario Sunshine" to kick Mario's ass, but, as always, he failed.
Mario: "I defeated Mechakoopa by throwing water rockets at him".
by Knuxman July 19, 2004
1 more definition
A mechanic Koopa made by Iggy Koopa and thrown by Bowser.
Bowser swung under the MECHAKOOPA's path and got bonked on the head.
by Eddie June 05, 2003