A heroes dose/heroic dose just refers to doing a very high dosage of a psychedelic substance like shrooms.
https://healing-mushrooms.net/heroic-dose
I’ve always heard a good normal dose is an eighth. According to that article linked above, a heroes dose is 5 grams, or an extra 1.5 grams beyond that.
Glad you had a good trip! I accidentally did a heroic dose of acid back in 2016 and I have been leery of psychedelics ever since (though I have done shrooms and a few other research chemicals since then). I had 2x 130µG tabs of acid in my sock drawer for ~18 months that I didn’t store in the freezer or anything, so I figured their potency had diminished and decided to take both. Big mistake. :)