<p><strong>Adjective</strong></p><ul><li>Slap-happier, slap-happiest</li><li>Severely befuddled; punch-drunk: "a slaphappy boxer."</li><li>Agreeably giddy or foolish: "After a martini he was slaphappy."</li><li>Cheerfully irresponsible: "a slaphappy crowd."</li></ul>