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2.
When someone is performing oral sex (on a penis) and air is trapped within the mouth and is forced out to create a vulgar sound; much like a queef .
Dude this one girl gave me head last night and totally marped

HHAHAHAHAH SHE TOTALLY JUST GAVE OUT A BIG MARP

Oh man, I am so embarrassed that I kept marping on him ...
by zoho April 28, 2009
 
1.
The sound a cat makes when it wants something or everything.
I knew it was dinnertime because I could hear the cat marping for food.
by pseudobree September 15, 2010