its the combination of the arabic slang word "manyouk" which means crazy or mean in the arabic slang and the word "monk" that stands for wise.
an abbreviation for a wise manyak.
girl 1: "we both want it, but he's not showing any sign of wanting it, so yeah he made me look like the one wanting it..."
girl 2:"he's such a manyonk, isn't he?"
Literally translates to fucker. Someone useless who wastes everyone's time, likes to fuck around. Mentally and physically draining. A prick, only calls when he needs something. Acts likes he's doing a favor, when infact you're the one doing him a favor.