heartikins
/ˈhɑːtɪkɪnz/Now archaic and rare
noun
Used as an oath to express asseveration, surprise, etc. Chiefly in od's heartikins.
Origin
Mid 18th century; earliest use found in Tobias Smollett (1721–1771), writer. Either a variant of heartlikins, or independently from heart + -kins, with insertion of -i- after bodikin, variant of bodikin.