Mastify 

To fuck up, mess up or destroy. Word originates from Cheboygan, Michigan.

I gotta take a dump. I'm gonna mastify the toilet!

Mastify by Buckostar November 19, 2010

Mastiff 

Mastiff is a large powerful dog that has a droopy face who loves to drool on the floor and your clothes when she comes over for a pat. She is an extremely protective family member and will challenge all intruders but is the biggest sook to those she loves.

Hagrid's dog, Fang from the Harry Potter movies is the most famous mastiff in the world.

Hey man, that mastiff is massive, can I give her a pat?

Sorry dude, you can't,she doesn't like strangers.

Mastiff by All in the mind July 1, 2016

english mastiff 

A huge fucking dog! That likes to steal your bed and like to cuddle and think they're a lap dog

Big ass dog!! Like huge English mastiff!!!

english mastiff by Stufflover October 5, 2013

Mattify 

A type of person who doesn't care about his friends, only cares about his role and has a biased father.

Hey you are just like Mattify! but a 2.0

Mattify by YouDonTNeeDToKnoW69 September 6, 2019

Mastiff 

Huge, undeterminably gigantic; gynormical

That wave was mastiff.

Mastiff by wil colligan February 9, 2008

bull mastiff

135 pounds of short-hair nasty that will cause strangers to shit their pants while at the same time lick the hand of their owner and devour any vermin that walks its way. The PERFECT porch dog! Gets respect at the vet (you KNOW what I mean). Little girls back away, then when you say, "No, it's friendly," smother the dog with huggs. It's why you love dogs in the first place!!

Oh, shit, that thing is gonna eat me-- Oh, it's just your Bull Mastiff.

bull mastiff by Fdale-boy March 4, 2011

mastiff 

the biggest, best, and most badass of all dog breeds.

My mastiff is 10 months old and he already weighs 100 pounds.

mastiff by jenna leigh November 12, 2007