Zena-Cheri Gormley, 21, and Laura Ramsey, 23, admitted causing grievous bodily harm with intent at a previous hearing at Gloucester Crown Court.
The court heard Gormley, of Lorne Street in Kidderminster, and Ramsey, of The Green, Ashleworth, Gloucester, had been on a night out with the victim.
It heard the 43-year-old was left with life-changing injuries.
Both women had been drinking heavily and said they had little memory of the assault, which took place in Pitt Street in the early hours of 17 June.
Det Ch Insp Rachel Williams said: "The CCTV from this case was one of the most disturbing pieces of footage I have seen.
"These women launched a totally unprovoked and vicious attack on a vulnerable man who was not able to defend himself.
"The impact on the victim and the list of the injuries he received is shocking - he currently needs permanent care and can't remember anything from the last few years, let alone the night of the attack."
BBC News
