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The most common might be One True Pairing. This is generally used from the perspective of fandom – people fawning over a high profile couple or cute couple or perhaps attempting to live vicariously through the romantic life of another. Or, it could be used sarcastically to deride the SMH if we are TBH arrangement between some suspicious characters. Or maybe it’s just two buddies hanging out using marijuana and enjoying cannabis.
Example: Now that is OTP, seeing Billie Eilish and her beau like that.
There is also One Time Password. This is more of a tech geek squad variation, like when you are referring to logging in to Google or Youtube or Yandex. It could also connect the inevitable aspect of facial recognition or use of fingerprints to unlock devices.
There is also One Time Pad and One Time Programmable.