A visible string undergarment worn by someone who's undergarments should never be seen by mortal eyes, resulting in mind-numbing horror and possible sanity loss. Referencing H.P. Lovecraft's cthulhu mythos
, where alien Elder Gods lurk around the corners of reality, waiting to feed on human horror and despair. In this instance, that Elder God is a 4-foot wide keester with a silk floss strand splitting the cottage cheese uprights.
Dude, Rosanne's cthong was all hanging out at the bar last night. I think I need to go see a therapist or poke my eyes out with a sharpened pencil.