vegeta had a tail it was rapped up on his waist and in ur question "was it krillens destructo disc" no it wasn't krillen used distructo disc on frieza and cut off his tail on earth that fat guy that eats alot cut off vegetas tail
IM INNNOCENT I SWEAR, IT ISN'T MINE, IT WAS A PRESENT, I WAS HOLDING FOR A FRIEND I DIDN'T DO IT!!!! DON'T LOCK ME UP PLZZZZZZZZ!!!!!!! OH GOD NO:bawl:
well it does grow back whjen he goes ssj3 but it dosn't grow back for such a long time bcuz once u cut off a saiya-jins tail it dosn't grow back in a long time or something like that