The only way to explain the meaning of the word Mebert, is in the Mebert language, which consists only of the word Mebert, said in various pitches, volumes, and inflections.
Someone who mooches off of everyone and in general has no consideration for anyone but themselves. A rude, deceiving, and selfish person.
Going out to dinner with a group of people and "dirt magert" orders a large meal. When the bill comes "dirt magert" suddenly realizes they left their wallet at home
The spawn of Carl Wheezer from Jimmy Neutron having sexual relations with Darla from Finding Nemo.
OR
An exclamation made while constipated on the toilet.
a fab friend who's really pretty and unique and has a brilliant music taste. unique name generally after Megenta in TRHPS.
a megenta is usually obsessed with anime and has really bRIGHT eyes and soft hair. If you know a Megenta you'll like her. Megenta is a fabulous friend and everybody who doesn't have a megenta in their lives' are missing out, but you can't have mine; sorry.