baby weight Share definition Flag n. something that someone else thinks is heavy, but is not heavy at all to you. Man 1-did you see him struggling to lift 150 lbs? Man 2-yeah, thats like baby weight to you. baby weight by Chitown4Lyfe February 24, 2009 0 0 Get merch Get the baby weight mug. Buy Now — $32.95 See more merch