Thagalvic Share definition Flag Pronunciation (Thag-all-vick) An exclamation word also used as "Oh my god!" or "Sh!t". Holy Thagalvic! That's huge! Thagalvic by Inspector_B February 24, 2017 0 0 Get merch Get the Thagalvic mug. Buy Now — $32.95 See more merch