Fat women know they're fat, unattractive, and undesirable, but they also know that many men like big tits.  So they think "Hey I've got big tits, if I show them off that means a man will want me". Of course most men who prefer big tits .. prefer big tits .. not saggy blubber-balloons. Fat women boasting about big tits is the same as unemployed people being proud they have afternoons of leisure.