I kind of see where I went wrong, I thought you were trying to say that chickpeas=bird dung.
In my defence though, when I went back to find your claim, it was kind of difficult to find it. Why were you talking about ancient merpeople and the Egyptian afterlife.
After investigating this it turns out nobody knows where this word comes from. They are just guessing. Cicer comes from Krios/Crius God of Sky, son of Oannes (Yonah). Peas comes from Peas (plural peasen) which comes from pisis/pisus etc. PISS.
Anyway, you're wrong. According to Wikipedia, pea comes as a back formation of pease (they thought pease was plural so they dropped the /z/ to make pea singular), which came from Latin pisum which came from the Greek πίσος, pisos
, if you can't read Greek. The fact that pisos, pisum, and pease (pea) all mean pea and the fact that peas are native to the Eastern Mediterranean, I'd say it's pretty plausible. They do know where the word "pea" came from, and it's not related to piss or urine and most definitely not dung, feces, defecate, and the like. Click.
(A Greek dictionary entry defining πίσος as pisum and pease.)
IMHO, this invalidates your entire claim.