Do You Spell Swanny?

To declare; swear.

What is Swanny?

archaic. : swanlike also : full of swans.

Why do people say I swanny?

'” Other sources locate the origin of the saying in northern England, and the Online Etymology Dictionary dates the word “warrant” to the 13th century. Through a type of phonetic assimilation or fusion, “I shall warrant ye” meaning, of course, “I guarantee you” over many years becomes “I swannee.”