An extremely tiny penis. Any guy with a baby dick belongs in panties, will be a virgin for life and deserves to be made fun of and humiliated forever.
Girl 1: Did you hear that Kevin has a baby dick?
Girl 2: HAHAHAHAHAHAHAHAHAHA
Girl 1: He definitely needs to be in panties!
Girl 2: And you know he'll be a virgin for life for sure!!
Both girls: HAHAHAHAHAHAHAHAHAHA
A little itty bitty tiny penis that can barely be seen. Usually under 3-4 inches. Not something you are proud to show people. Upon being asked this question one with a baby dick will usually be hesitant out of fear from showing said baby dick.