Irishism
/ˈʌɪrɪʃɪz(ə)m/noun
1A statement which is manifestly self-contradictory or inconsistent.
2A characteristically Irish word, phrase, or idiom. Also occasionally more generally: a characteristically Irish belief, attitude, or trait.
3Chiefly depreciative. The fact or quality of being Irish; Irishness.
Origin
Early 18th century; earliest use found in Edward Ward (1667–1731), satirist. From Irish + -ism.