A term used for two individuals who are constantly shipped together, but they claim to just be besties. However, no matter what they claim, they are clearly in love.
Person A: "Hey have u seen those bustedtees girls on UD ?"
Person B: "Yeh i'd hit it"
Person A: "Hum yeh but their shirts are not SILF..." (SILF for Shirt i'd like to fuck)
Person B: "rofl"