Dinner killed Grandpa Johnny before he could dig into dessert.

An 86-year-old man who won a free ménage-a-trois at the famous Bunny Ranch choked to death on a piece of steak shortly before his promised night of carnal delight, said brothel owner Dennis Hof.

Eager octogenarian Johnny Orris, shortly before his last meal, said he was looking forward to “the greatest day of my life” — only to die Thursday on the floor of a Nevada restaurant.

“The guy was so full of life,” said his grandson Ed, who entered Orris in a Howard Stern-sponsored contest for a night of passion at the Nevada brothel.

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“He was on cloud nine, and anxious to get back to the Bunny Ranch,” said the 49-year-old grandson, who stopped by the pleasure palace with gramps that afternoon. “He told one of the girls, ‘I’m gonna be back here at 9 o’clock — you’d better be ready!’”

Hof was astounded when Ed returned to the ranch with word of the balding, bespectacled prize winner’s sudden demise before the grand finale of his all-expenses-paid trip.

“Johnny said that he was prepping for the ‘Super Bowl of Sex,’ ” said Hof. “And he never got there.”

Johnny Orris lived alone at his home in Sullivan, Ill., after his wife died 11 years ago, according to his grandson.

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It was Ed’s idea to bring the randy retired farmer to New York for the Stern show contest tied to the Johnny Knoxville movie “Bad Grandpa.”

After winning the October competition, Orris was counting down the days until his night with call girls Caressa Kisses and Rain Riches.

“He was ecstatic,” recalled his grandson. “He’d been that way ever since our trip to the Stern show.”

The grandfather began swapping emails with Kisses in a bit of cyber-foreplay, Hof said.

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“This went back the last month, month-and-a-half,” said Hof. “He was excited to be with Caressa, and she was excited to be with him.”

The two generations of Orris men spent Thursday afternoon at the Bunny Ranch bar flirting with about 40 women after flying in from Illinois, according to Hof.

“The bunnies loved him,” said Hof.

The pair, accompanied by a pal, then headed to dinner at Harveys Lake Tahoe resort to grab some steaks with a promise to return by 9 p.m. for grandpa to join in the threesome.

But two bites into his prime rib, Orris began choking — and his grandson said repeated attempts to save the senior citizen with the Heimlich maneuver were unsuccessful.

“It was unbelievable,” recounted grandson Ed. “The paramedics worked on him for 30 minutes. We’re still kinda stunned.”

The upset grandson later found solace with one of the ranch’s working girls when Hof granted him a freebie.