Wednesday's (Valentine's Day) Random Slang-o-rama: Filly and foal

My choice for this Wednesday is not entirely random. Given that today is Valentine's Day, I specifically went hunting for slang appropriate for the occasion.

You may wonder what horses have to do with hearts and flowers, but, ah, wait until you read how the phrase "filly and foal" is defined in Passing English of the Victorian era: a dictionary of heterodox English, slang and phrase by J. Redding Ware (pub date 1909).

So, hold your horses (another bit of slang)...
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because...
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...here is the definition:

Filly and foal. A young couple of lovers sauntering apart from the world.

Bring on the hearts, flowers, and chocolate!

Not quite sauntering, but definitely in their own world... (Illustration from India by John Hobart Caunter, 1872)