sonsick Share definition Flag Beyond lovesick. So deeply in love with a person you’re thinking about your future kids. Coined by the band San Fermin. He’s got her sonsick. She has a whole list of names planned and everything. sonsick by Eggs Benny November 2, 2018 0 0 Get merch Get the sonsick mug. Buy Now — $32.95 See more merch