Its a word of endearing. When your significant other says something along the lines of "I love you the most" you can say "well, I love you the mostest"
by Just_a_sensitive_Leo June 7, 2018
Get the Mostestmug. by Ohh.sav August 29, 2020
Get the Mostestmug. A term created to express an amount so great that the word "most" just doesn't do it justice.
Greater than more...
Greater than most...
The greatest is mostest.
Greater than more...
Greater than most...
The greatest is mostest.
by Melanyyydeee July 30, 2014
Get the Mostestmug. 
The ultimate mic drop quantifying word that means this is the most (blank) that there can be for this subject. THE END!!!
This is how you let your woman/man that you love them the most, the mostest-er
This is how you let your woman/man that you love them the most, the mostest-er
I love you mostest-er.
Example:
Fritz: I love you
Kendra: I love you….
Fritz: I love you more….
Kendra: I love you most……
Fritz: (ahem) well I love you mostest-er
Kendra: (eye roll, then a squinty smile) you dork. Kiss me
Example:
Fritz: I love you
Kendra: I love you….
Fritz: I love you more….
Kendra: I love you most……
Fritz: (ahem) well I love you mostest-er
Kendra: (eye roll, then a squinty smile) you dork. Kiss me
by Gator loves Kendra October 23, 2023
Get the Mostest-ermug. by Lucy.Kranium August 8, 2023
Get the I love you super mostestmug. 