'Cake Boss' Buddy Valastro Reveals Horrific Details of Hand Injury

"Cake Boss" Buddy Valastro is sparing no details of his horrific bowling accident, but says the gruesome injury's left him more grateful than ever ... for his family and the doctors who saved him.

Jersey's other Boss joined "TMZ Live" Tuesday to give his account of the freak bowling accident, telling us he's got a long road to recovery ahead due to severe tendon, nerve and muscle damage to his right hand.

Word of warning ... if you're enjoying a piece of cake -- or any food -- right now, finish up before watching Buddy's description of the pinsetter machine impaling his hand.

As we reported ... Buddy was bowling with his fam on their at-home alley and tried to fix the malfunctioning pinsetter. Buddy said the "blunt force" he felt as a metal rod repeatedly rammed through his hand was by far the worst pain he's ever felt.

He also revealed it wasn't just his hand that was severely injured 😬 ... and gushed about the amazing job his family did to free him from the evil machine to get him to a hospital.

As for the road to recovery ... the "Cake Boss" told us it's gonna be a long one -- but he said it's giving him a newfound appreciation for the medical pros doing miraculous work to fix his hand.

Sounds like renowned orthopedic surgeon Dr. Michelle Carlson can expect a Christmas card, and probably a cake too!