Live with the shame forever.

Just kidding, there is no way, but nobody cares.

We all know you didn’t "accidentally like that donkey porn"

depends on your client. E.g. in Amethyst you just hit the button again. #nostrudel https://nostrudel.ninja has a "likes" tab in your profile where you can easily find the unwanted like. Hit the three dots menu on the right of the entry and select delete.

But beware not all relays support event deletion and not all really do.