We should be less coy with these types of discussions or we run the risk of giving the wrong impression (or the desired impression depending on the commentators agenda). People will naturally attempt to fill in the blanks when rumour or innuendo is present. Saying categorically what it wasn't, but then not elaborating on what it was, obviously invites the person to infer from what is left. From the context below above, this hypothetical person is invited to assume that it must then have been semen, urine, feces, menstrual flow or smegma in the game once upon a time if it wasn't vomit or blood. And from Neon's poor attempt at a joke they are invited to believe that these things were once in the game and only removed because Toady had some sort of maturity epiphany.
As far as I know, semen, urine, feces, menstrual flow and smegma (and any other bodily fluid or excretion that you might believe requires censorship) have never been in the game. If they were in the game it's not the sign of an immature twat directing the game's development. Context is the key. If they were in the game but unavailable to the random titan materials would show no more than a design decision, not that the materials themselves or the decision to include them was innately juvenile.
I know we have differently coloured squiggles of yellows and browns to indicate filth as a catch all. And we've had the white squiggles that were associated with the tentacle demons of old that seem to have been a nod to hentai monsters. None were specifically labeled. If we're talking about something else let's be clear.