[boo.by] n, pl boobies [modif. of Sp bobo, fr. L balbus stammering, prob. of imit. origin] (ca. 1603) 1: an awkward foolish person: dope
2: any of several tropical seabirds (family Sulidae, esp. genus Sula)
[2]boo.by n, pl boobies [alter. of bubby] (1934): breast--sometimes considered vulgar