no
It is not necessary to capitalize the word "yo".
yo mom
Yes. You Yes Young Yo-yo Youthful Yarn
Yo face is burly
Yo son is a hostage.
I will grieve when you are gone.
Hey, yo, what's up!
yo ma ma ha to revise
yo yo came from the word yo
(from the stringed toy, to vacillate, or alternately a dull-witted person) "My yo-yo became stuck in the bus door." "The driver must have thought I was a real yo-yo." "The candidate was known to yo-yo on critical issues."
The authorities' reprisals did not result in quelling the insurgents.
yo mamma denser than uranium.