Definition

A portmanteau of "ridiculous" and "lust" describing a couple so aggressively infatuated with each other that their public displays of affection have become a biohazard warning to everyone nearby.

Example Usage

Their constant hand-holding and kissing in the grocery store is absolutely ridiculust—I came for milk, not a live-action romance film.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=ridiculust&defid=5252185)