Grossus Shlongus Personus Share definition Flag A way to call a person a giant dick without that person to know what you just said. You are such a *grossus shlongus personus*, Steve! Grossus Shlongus Personus by SisterFister2000 January 10, 2020 0 0 Get merch Get the Grossus Shlongus Personus mug. Buy Now — $32.95 See more merch