What does Elvii mean in slang?

Elvii means in slang: A speshul is someone who makes you smile, even when your tears are running down your face.
(in Slang Dictionary, added by Iguanakee115)

What else does Elvii mean?

Elvis is a plural.
(in Slang Dictionary, added by Bryson Richard)

Plural of Elvis. You’ll be able to understand the meaning of this sentence.
(in Slang Dictionary, added by Maeve Allison)