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adj : The highest possible quanifier of a certain object or feeling

When used, it definitively signals the upper limit of whatever is being quantified.
M. I love you
F. I love you more
M. I love you the most
F. Well, I love you 3000
M. I love you the mostest
mostest by i win :) July 9, 2025

mostest ever 

Heather loves Andy the mostest ever.
mostest ever by Hannahs mommy December 30, 2007

mostest with the toastest 

A phrase used to mock oneself, or to express sarcasm in a situation that is normally serious.
Man #1: "I am SO hungry!

Man #2: "No way! I'm the mostest with the toastest!"

Man#1: "Hah! by his use of sarcasm, I can tell that in reality, I am hungrier!"

Mostest-Ostest 

The largest real number imaginable. It is equivalent to infinity -1.

Generally used in disputes to quantify how much one likes/dislikes something.
(Guy) This burger is awesome. I love burgers.

(Girl) I love them more than you, I love burgers the most.

(Guy) I love burgers the Mostest-Ostest.

(Girl) Your mathematical superiority has left me with no viable response. I bow down to your supreme love of burgers.
Mostest-Ostest by Professor Smith November 25, 2006

Mostest with the Hostess

A cruel and unusual twist on the commonly-known phrase "Hostess with the Mostest", which is normally used to describe either a) the Denny's Hostess with the biggest rack...or b) the Hostess that you'd mostest like to anally violate. To the dismay of male chatters around the world, this phrase is used to symbolize many an AOL woman, who not only have an unhealthy desire to accumulate more Twinkies and Suzy-Q's than any other household on the block, but use their impressive cache of baked goods to provide sustenance for the hours upon hours they spend in chatrooms.
JWeed439: "Yo Rylie...have you seen the size of the ass on Jenny lately?" Rylie: "Dude. How can you miss it. She's gotta be the Mostest with the Hostess."