native English speaker here, but I also know a conlang called toki pona. problem is that I can't do a good translation of this phrase because "sigma" in this context means... pretty much nothing as far as I can tell? in fact the entire phrase is nonsense

so it could be "mi pilin sama sitelen Sima pi toki Elinika" (I feel like the Greek letter Sigma) or "mi pilin mu mu mu" (I feel random noises)