Mosteststststts 

It means that Zander is right and he loves Sophia more.

Sophia : Hey Zander I love you, Mosteststststts
Zander: I know baby, you realized it now

Mosteststststts by zanderrlovessophia August 7, 2022

moststststtststst 

Something that my boyfriend says when he thinks he loves me more but he is incorrect.

Person #1- I wuv you
Person #2- I wuv you too
Person #1- I wuv you more
Person #2- I wuv you mostest
Person #1- I wuv you moststststtststst

moststststtststst by _.lil.sheit._ August 29, 2018