747 Sinker Share definition Flag adj. a solid, unbroken turd that disappears out of the pan and runs straight up the u bend. my God! where did that shit go? must've been a 747 sinker... 747 Sinker by master codder November 9, 2010 0 0 Get merch Get the 747 Sinker mug. Buy Now — $32.95 See more merch