late 14c., from pyss
"urine" (in reference to the acrid smell of an anthill) + mire
"an ant," probably from O.N. maurr
"ant," perhaps distantly connected with Gk. myrmex,
"ant." Cf. pissant,
also early Du. mierseycke
"urine"), Finn. kusiainen
"He is as angry as a pissemyre,
Though þat he haue al that he kan desire."
Applied contemptuously to persons from 1560s.