VSTI Share definition Flag Stands for Virtual Sexually Transmitted Infection. A virus or malware resulting from frequent viewing of porn. man, the guy at Geek Squad told me I had a VSTI. Luckily, my mom didn't know what it meant. VSTI by Taevis662 November 2, 2009 0 0 Get merch Get the VSTI mug. Buy Now — $32.95 See more merch
