‘U’

Ultimate

(adjective) – The best; nothing beats it

Ummm this isn’t real

(saying) – When something you would never expect to happen happens
See: Ummmmmmm

Ummmmm mom

(saying; said in a high-pitch primordial voice) – When you want something from someone and are about ask
See: Ummmmmmm

Ummmmmmm

(saying) – You are about to say something shocking