Wiktionary
vb. (present participle of yuk English)
Usage examples of "yukking".
Goofy, Pluto and the other construction supervisors are yukking it up today.
He ripped his mask off and heard the laughter over his heaving sobs, all the old hand riggers standing around, yukking it up at the new kid getting the shit scared out of him by the foreman and his segundo, who were stepping through the air lock even now.
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.
The new guy yukked it up, too, but while he was yukking he dropped his Popsicle, then felt my calves and ankles as he picked 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.