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A person who is funny, likable, and just plain nice. Usually sweet and is a jock that is not a jerk.
hey, you know that one kid? he's such a mardo!

That Mardo kid is amazing!
by Darkie 411 March 18, 2009
The accumulated scum from scraping down one's balls with a credit card after a week-long Mardi Gras trip.
Ew. What's this mardo doing on my computer?
Dude, that cheese smells like mardo.
by Mr. James Duffy July 17, 2013
a type of insect that bites the heads off praying manti when it feels a territorial threat.
did you see that mardo attack your grandmother?
by kalzomard April 15, 2004