A word that is said as a squeal of joy, usually said in a VERY high pitched tone of voice.
John: HEY! It's snowed anough the we're not going to school tomarrow!
Elijah:SHMII!!!

Pronouced Shh-mE
by Elijah W. February 1, 2008
Get the shmii mug.
The most amazing person who has a big brain when it comes to every subject.
Wow that person is shmiy
by Definitelynotme✌️ May 28, 2021
Get the shmiy mug.