I Already "Befriended" Your Mom Last Night Share definition Flag The famous line that Sans Undertale said in Deltarune. Your mother, huh? Too late. I already "befriended" your mom last night. I Already "Befriended" Your Mom Last Night by GNSGNY December 22, 2018 0 0 Get merch Get the I Already "Befriended" Your Mom Last Night mug. Buy Now — $32.95 See more merch