fistable 

A person who is so loose a fist can be inserted.

She's a fistable slut.

fistable by Reggie Pumpernickel October 10, 2016

firstable

What an idiot says instead of First Of All.

Firstable, I am a fuck whit that doesn’t understand English so your argument is invalid

firstable by DumbAsses November 12, 2014

Firstable

The first point in your argument. Very commonly spelled as "first of all", but that is incredibly incorrect.

Origin: Danielle Fisher (2017)

"Firstable, Danielle eats hermit crabs. Secondly.."

Firstable by firstableisaword July 18, 2017