Uneven boobs refer to tits on a woman that are not the same size. Although no two breasts are exactly alike, some women have two boobs that are noticeably different in size and shape. Typically, the more breast tissue the better, and few men care whether or not it is evenly distributed.
Photos of Women with uneven sized tits, asymmetric tits, lopsided tits
From VoyeurClouds' Wiki