DH and I refer to 'the milks'--'Do you want the milks?' or more often 'Aieee, I think she needs the milks'. It was originally supposed to refer to the milk itself, not my breasts, but my little sister came over today to visit DD and said 'Look, she's staring at the milks!', so I guess it morphed.
I guess it's nice my little sister is so comfortable about breastfeeding--she's too shy and proper to use the word 'breasts', but apparently I've acclimatised her somewhat to the concept, at least.