From the video game Fallout 3.
The children in Little Lamplight used it as an insult to adults.

Anyone involved with Rugby League be it fans, players, coaches, administrators, reporters etc. These Mungoes also tend to be incorrigible reprobates and are best avoided.

A mungo is a dumpster diver - someone who looks through trash and takes out all the valuable stuff

(verb) To enhance, improve or make something go harder, faster and so forth.

A mumbling scotsman who lives on a decrepet sailboat and speaks in completely broken english even though it is his first language. He enjoys telling incoherent stories and freaking people out with his bizarre manners and accent.

realy realy big
quite large

a kid who is so British, he drinks tea 6 times a day with 3 Warburton Crumpets and a Teacake. Also someone whos sits on Discord and has Supper everyday.