thrunch Share definition Flag The act of inserting one's (or another's) genatalia in an oven in order to attain orgasm. I came home to find Alasdair lying dead on the floor. It was yet another case of death-by-thrunching. thrunch by threefour December 2, 2004 0 0 Get merch Get the thrunch mug. Buy Now — $32.95 See more merch