"peas collectively," Old English; see pea, of which this is the original form. Pease-porridge "a porridge made of pease meal" is from 1530s.
colloquial modern alternative spelling of shit (n.), attested by c. 1740, preserving the original vowel length of the Old English verb.
"sexual attractiveness," 1937 (umph), suggestive visceral physical sound. Ann Sheridan (1915–1967) was the original Hollywood oomph girl (1939).