Frankston MP Geoff Shaw's misuse of his parliamentary car has been referred to the privileges committee, but the embattled government MP's evidence will not be heard in public despite efforts by Labor.

The referral ended a chaotic day in Spring Street, which began when Mr Shaw was accused of calling Labor MPs ''wankers'', as well as making an obscene gesture, in Parliament.

Mr Shaw withdrew the comments ''unconditionally'' at the third attempt - he twice withdrew, conditionally, saying he would withdraw ''whatever it is''.

He later issued a statement saying he said ''wackers'' and was simply pointing at the opposition. Labor backbenchers, who were in the chamber, disagreed with this.