MAYGRUM 

A person you dread seeing in a bar because you know when they see you, they will make a bee line straight for you, bore you with stories and questions and never get the hint to leave.
They are usually alone and drunk.

I was out last night in a bar when that MAYGRUM, John Smith came up to me again and told me that same stupid story about how he knew me when i was a kid. He followed us to the next bar but we eventually lost him in the nightclub.

MAYGRUM by Jackyboy80 July 20, 2012

Mangrum 

to be held up long enough for your lunch to spoil

not necessarily pejorative

That lecture was so Mangrum my sandwich was rancid

Mangrum by kmfrayed April 16, 2012

magrum 

Person with low expectations

that person is a magrum

magrum by mmmmm..money April 17, 2021