E'asio

IPA: /e·aɪze·ɔ/
Phonetic Respelling: /e-eye-zee-oh/ (Repselling using American English, first "e" in long vowel form.)

Slang term of disputed origin. Can be used as follows:

Adj. - To be underwhelming, mundane, not meeting expectations, lackluster, unexpected (usually negative), or done poorly.
Int. - Suprise, a state of being startled (More commonly expressed with the derivative, "E'asio'na")

1: That film was so boring.
2: I know, it really fell short of my expectations, so e'asio.

Sigma

Sigma (Σ, σ, or word final ς) is the Eighteenth letter of the Greek Alphabet, representing the sound /s/ or /z/.

7-year-old: I’m so Sigma.
Middle-Aged Greek Man: Σώπα, ανόητο αγόρι. Δεν είσαι το γράμμα Σίγμα. (Shut up, stupid boy. You are not the letter Sigma.)