What is a flutter in British slang?

From Longman Dictionary of Contemporary English have a flutterBritish English informal to risk a small amount of money on the result of something such as a horse race SYN have a bet → flutterExamples from the Corpushave a flutter• I had a little flutter on the Grand National and won £5.

Atrial flutter is a type of heart rhythm disorder in which the heart’s upper chambers (atria) beat too quickly . In atrial flutter, your heart’s upper chambers (atria) beat too quickly. This causes the heart to beat in a fast, but usually regular, rhythm.20 Kas 2020

If someone makes your heart flutter, you find that person very physically attractive and you feel excited when you see or talk to them : James has been making hearts flutter ever since he joined the company.

In case you didn’t know, fanny flutter is the slight tingling sensation a person with a vagina will get down below when they see someone they have a sexual attraction to . The tingling sensation could range from contractions in the vagina to actually feeling like you’re going to have an orgasm.