sealedwithakiss Oft-abbreviated love letter phrase Love letter words often written as an acronym Like romantic envelopes Envelope endearment Chocoholic's favorite romantic song? Back-of-envelope inscription 1962 hit that starts "Tho we gotta say goodbye for the summer ..." 1962 Brian Hyland hit 1962 hit that starts "Tho we gotta say goodbye for the summer …" Message accompanied by red lips S.W.A.K. "S.W.A.K." on an envelope Love-letter envelope phrase Oft-abbreviated love-letter phrase Like a good Valentine's Day card