"Huckle bearer" theyre the things you grab onto when your holding a casket
All these years I thought he said huckleberry. I truly learned something new today
Edit:
Apparently there is a huge online argument about this. The script did say huckleberry, but huckle bearer is more valid term
http://rafaelmarquez.me/writing/im-your-huckleberry-or-is-it-im-your-huckle-bearer/
In the old Georgia (where Doc Holiday originated) the men who would bear (carry) your coffin in a funeral procession wore small huckleberry branches in their lapels. They became know as the “Huckle Bearers”. When Doc says “I’m your huckleberry” he means that he is your coffin bearer….. or more to the point… he will be the one to PUT you in your coffin.