lovey-dovey:

1. Mushy sentimentality.
SYNONYMS: bathetic; maudlin; mawkish; mushy ; romantic; slushy ; sentimental; soopy; soppy ; sticky ; tear-jerking.

2. Expressing much love or affection ; expressing love or affection in a very affectionate or sentimental way ; effusive in one's expression of sentiment; mushy . See love for synonyms.

3. In the 1870s, a couple were said to be lovey-dovey if they were serious about one another.