Wiktionary
yukking it up
vb. (present participle of yuk it up English)
Usage examples of "yukking it up".
Goofy, Pluto and the other construction supervisors are yukking it up today.
Autographed photo of William with George Bush at The Peking Gourmet Restaurant in Arlington, Virginia, a harshly flash-lit amateur snapshot, Cozzano and Bush eating Peking duck in shirtsleeves and yukking it up.
Me and Shivetya were yukking it up like a couple of old tonk buddies.
He'd save seventy bucks on his combined insurance the first year, but he couldn't afford the outlay - and you couldn't tell him different with those clowns standing around yukking it up.