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1.
A person know to be awesome, Also the writer of the dutch national anthem. Hero to all dutch people
Person 1:God, i wish i was like marnix.
Person 2: Yeah i wish i had skills like him.
by Vlaflip October 14, 2009
 
2.
To drink beers with your colleagues, and leave before the bill arrives.
"he did a marnix on us last night"
by hurt July 15, 2004
 
3.
To Marnix - to plan in a poor and haphazard manner with little hope of the outcome being successful.
Goering: What's Hitler doing?
Himmler: He's Marnixing around, something about invading the Soviet Union.
by a-friend7 February 12, 2010