Former Ballarat television presenter Frederick Fargher told the Victorian County Court Disney invited him for drinks in a television station dressing room and said he wanted to get into a co-worker's ''pants''.

Mr Fargher said Disney told him, ''I'm going to get into [his] pants tonight and I want you to be there so it'll look less suspicious.''

Mr Fargher said Disney would often play the fool and he wasn't sure if he was serious.

''I remember saying, 'Oh Gavan','' he told the court.

''He just said, 'Just do it' and he walked away.''

Disney, the co-creator of the Nine Network's long-running program Hey Hey It's Saturday, is fighting accusations he assaulted a teenager with whom he worked at Ballarat television station BTV6 almost 30 years ago.

The 60-year-old has pleaded not guilty to 13 counts of indecent assault and two of rape over alleged incidents relating to the person.

The jury has heard the abuse began soon after the alleged victim joined the station in 1980, aged 17.

Mr Fargher said he went with Disney to the dressing room and the alleged victim soon joined them.

Both Disney and the complainant were drinking alcohol and were joking, he said.

Mr Fargher alleged Disney ''mildly encouraged'' the teenager to keep drinking and repeatedly asked him to take off his pants.

The teenager removed his clothes and Disney began fondling his genitals, Mr Fargher said.

Disney then fondled the teenager's genitals with shaving cream, before the boy vomited on to the carpet.

Under cross examination, Mr Fargher denied abusing or having any sexual interest in the alleged victim.

He also denied lying about what happened to become a police witness and avoid charges.

''As God is my witness, I am not,'' he said.

He also denied being motivated by a professional vendetta towards Disney whom he believed had wanted to sack him from BTV6.

The trial, in Ballarat in central Victoria, continues today. AAP