Litterally, I think it means something like "cool-lovey".
Kuudere's are very businesslike and blunt and appear stoic, sever, and 'cold' to the world, while hiding their softer side internally. They can be a little dumb in regards to normal human relationships, since they don't usually have many, but are very loyal to those they love. They tend to get flustered (internally or externally) when in front of their crush since they don't know how to deal with those 'new and unfamiliar' emotions, sometimes they see these feelings as a weakness (hence why they hide them.)
Right now my favorite kuudere, for example, is Captain Jullius from 'This Girl is a Little Wild'.
Looking for manga suggestions with a male protagonist/main love interest kuudere. Thanks for any help! ヾ(❀^◡╹)ノ~