What is the olive theory from Tiktok?

The olive theory actually started trending on Tiktok as of early 2023, leading younger generations to get familiar with How I Met Your Mother and one of its most popular relationship theories. At the time of recording, the #olivetheory hashtag has accrued over 130M views.
Fans of 2000s sitcom How I Met Your Mother can no doubt remember how the main character Ted Mosby is a hopeless romantic, and spends the duration of the series searching for his soulmate. But only the most hardcore of fans will remember the very first episode of the Hulu series, when Ted introduces something called the olive theory when talking about relationships. 
What on earth do olives have to do with romantic compatibility? In under 3 minutes, we answer your questions!
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A Bababam Originals podcast written and realised by Joseph Chance.
First broadcast: 21/09/2023
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