A style of speech, vocabulary or pronunciation of (supposedly) English - that is otherwise unintelligible, as if spoken by a mong- usually occurring as a result of severe substance abuse.
The guy was fucked. I couldn't understand a word he said - he was speaking complete monglish.
by Nick Vasey March 10, 2004
English spoken by complete mongs which comes out in the form of complete gibberish.
His grasp of monglish was second to none!
by tronski August 19, 2005