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2.
A period of time when one is feeling down and out. Depressed, hopeless, lonely and sad.
I do not feel like going out tonight because I have the mully grubs.
by born2bblonde June 22, 2006
 
1.
a very dull individual. one who would rather work or do things a normal person would not enjoy doing, instead of having fun.
Josh: "Sam, you should come to my party tonight."
Sam: "No, I'm having dinner with Melissa."
Josh: "You're such a mullygrub."
by christmahannukwanza December 15, 2010
 
3.
At our house, mullygrubbing always meant feeling sorry for oneself, being in a blue funk, morose...a GrubWort, on the other hand, is a very dirty little kid, usually with sand/ dirt/food, etc. stuck to his face and hands
She had been mullygrubbing all day, complaining and scowling.
The little GrubWort left tracks all over the kitchen floor.
by Vintageof47 September 04, 2007
 
4.
In North Staffordshire - England, "Mullygrubbing" is a form of punisment, usually given by an older brother to a younger sibling. A kind of bullying. To mullygrub someone you must get the victim into a position whereby there head is clasped between your upper-legs, face forward, scalp to you. Then you rub your knuckles agressively into their hair for several seconds - even a minute or two has been known. Ask my younger sister!
Melanie you twat! For nicking my fireworks I'm going to give you a jolly good mullygrubbing!
by Andy Gann January 18, 2008
 
5.
The little pieces of lint that accumulate in your belly button from wearing cotton t-shirts.
Over the years I've collected enough mullygrubs to make a pillow.
by Joseph Lee April 05, 2007