Quellfack Share definition Flag To explode in an obscene sounding mouth ejaculation of epic proportions. Generally a sound of disbelief. "Hey." "Hi." "Your mother!" *Quellfack*COMMENCE LOLFISH! Quellfack by Commander Klenesheitz October 22, 2009 0 0 Get merch Get the Quellfack mug. Buy Now — $32.95 See more merch