Menkstar 

A word used to describe a person who is not nice and can be lousy or ungrateful.

Oi that guy is such a menkstar he didn't even say thanks when I gave him some fresh creps.

Menkstar by Mark1Moo December 3, 2018

menkster 

The area inbetween a man's balls and penis.

"Man my Menkster is itching me horribly"...

menkster by PenguinLoverforeverr May 6, 2008

Mentstard 

A combination of Mental and Bastard.

To be used in a situation to define a person who is doing something crazy/ out of the ordinary.

"Yeah, he was surfing down the stairs whilst doing a headspin, he's a right mentstard"

Mentstard by Captain-Matt April 12, 2009