Synonyms of back-slapping

1 Syllable
gay
2 Syllables
genial, jovial, cheerful, merry, jocund, mirthful, festal, pleasant, heartiest, clubby, happy, friendly, heartier, hearty, deep-felt, jolly
3 Syllables
sociable, holiday, festive, vivacious, lively, hilarious, convivial
4 Syllables
entertaining, conversible, glad-handering
5 Syllables
companionable