The rapper was at the White House Thursday to perform at a tribute to jazz legend Herbie Hancock and appeared to be at a reception when the unlikely knuckle knocking took place.
Wearing a crisp tuxedo and sunglasses, his trademark dreads loose on his shoulders, Snoop seemed to be lauding Hancock as the father of his own art form.
"He invented hip-hop, that’s why it only makes sense,” the rapper can be heard saying to John Kerry, who had his wife, Teresa Heinz Kerry, close at hand.
It was the politician, not the rapper, who went in for the tap. And after, Kerry complemented Snoop's skills.
“You gave me a good pound," he said.
Snoop posted a video on his Instagram account, which got more than 24,000 likes. It was tweeted by the official State Department Twitter account, with a message signed from Kerry himself.