Nut udders are the udders that descend from ones nuts after prolonged periods of having people be "all up on your nuts". They are similar to cow udders in that people could in fact suckle them but unlike cow udders they produce no milk for nourishment. The sole purpose of nut udders are to serve as a comforting sensation for those that are constantly all up on your nuts.
Mel: So have you seen that new movie yet? Everyone seems to be saying it is good but I am wondering if it's just because they have met the writer.
Becca: I don't know I haven't seen it but I've been hearing mixed reviews.
Mel: Yeah me too. I think it's just because they are all nursing from his nut udders.