Patience of a gnat 

To be very impatient

I have the patience of a gnat.
He won't be able to wait that long. He has the patience of a gnat.

Patience of a gnat by LydiaRae June 1, 2018

tight as a gnat’s twat 

not generous and does not like spending money,miserly,mean

He was tight as a gnat’s twat that he counted every biscuit in the tin!

tight as a gnat’s twat by Mehrdad.Hosseiny January 26, 2009

hung like a gnat 

You can imagine the minute preportions of a gnats sexual organs.

As soon as she found out I was hung like a gnat, she wanted nothing to do with me.

hung like a gnat by Ed Skunk May 24, 2006

Slick as a Gnat's Ass 

An unusually suave female possessed of a kind of amiable alacrity.

Well, ain't she slick as a gnat's ass!!!

Slick as a Gnat's Ass by Aziz Ibrahim November 24, 2009

On that like a dong gnat 

To act upon a given task immediately.

Mom, I'm ON THAT like a DONG GNAT!

On that like a dong gnat by Dani San December 1, 2010

agnathiest 

One who follows the basic definition of agnosticism but leads more towards athiesm than religion.

Lots of people don't know the word agnostic, so I just say I'm agnathiest.

agnathiest by babaloulou November 15, 2003

agnathetic 

A portmanteau of 'agnostic' and 'apathetic' being the uncertain belief that you don't care about anything.

"Dude, isn't that your house on fire?"
"Yeah."
"Aren't you going to call the Fire Department?"
"I should, but I'm feeling a bit agnathetic about it."

agnathetic by Brax Fortex November 24, 2011