From Longman Dictionary of Contemporary Englishsappysap‧py /ˈsæpi/ adjective 1 American EnglishEMOTIONAL expressing love and emotions in a way that seems silly SYN soppy British English a sappy song2 HBPfull of sap (=liquid in a plant)
Examples from the Corpus
sappy• If the plant grows emersed, the leaves are dark green, stiff, leathery, sappy and very acutely branched.• Just plain sappy is more like it.• In a sappy January 19 letter, Likins informed them they have one month to submit their appeal documentation to him.• a sappy love song• No sharp notes of sappy odours textured the blue air.• With clunky writing, the characters are simply shallow, callow and cold, when not being sappy or self-pitying.• Each of us struggles daily in a never-ending war between our brilliant selves and our sappy selves. 