v.display excessive cordiality (towards)

"he is always backslapping his colleagues at staff meetings"

Converting Benchslaps to Backslaps
On suntans, backslaps
Happy Anniversary: Liberals, Opposition Mark Year One with Brickbats, Backslaps
BEAR HUGS BLAIR; Backslaps and Praise as Tony Meets Boris
Crane leaves office in style: cheers, bands and backslaps
Perry prefers to gain respect over backslaps
Pacts and backslaps as election nears
Back slaps and hugs greet Masters champ
Back Slaps and Business
Both Sides of Aisle Give Edgar Hearty Back Slaps Suburban Leaders Wistfully Say Goodbye to Governor