Filian is an English-speaking VTuber known for loud, chaotic comedy streams and quotable shocked reactions. This 'omg it goes so deep' line comes from that style of moment, clipped by viewers because the phrasing lands as an accidental innuendo. Like many Filian soundbites, it spread through fan soundboards, Discord servers and short-form edits where creators reuse her expressive delivery as a reusable reaction. It endures because the joke is flexible: any visual about depth, length or hidden layers can carry it, and her tone sells the laugh without extra context.