GrumbleBoat 

used to describe either;
a) a male/female with an horrificly ugly face or
b) someone with an angry face similar to a gurn

derived from two seperate cockney rhyming phrases;
1)Grumble=Grumble and Grunt=Cunt
2)Boat=Boat Race=Face
so the translation is clearly cuntface...

'look at the GrumbleBoat on that...she was grim!'

'That dude was livid, he had a proper GrumbleBoat on him'

GrumbleBoat by grumble-love July 15, 2009

Grumblebrag 

To complain in a superficial manner, when one is really just boasting.

I have to wear my wedding ring or else I just get hit on too much. I'm not actually annoyed, I'm just grumblebragging.

Grumblebrag by das Luftkissenboot November 13, 2014