light-o'-love

An old tune of a dance, the name of which made it a proverbial expression of levity, especially in love matters.

Best sing it to the tune of light o' love.

Someone who is inconstant in love; a flirt.

You light-o'-love, a word or two.

A promiscuous woman, a prostitute; a mistress or female lover.

That is why a priest's light-o'-love is always some honest man's wife.

He had still another turn with a light-o'-love.