The last thing Belle Nolan expected when she went to a Spiderbait concert was to be urinated on.

But on February 26, that's what allegedly happened to the 33-year-old and she believes it's not an uncommon story.

She said she felt liquid on her leg as she watched the band play about 10.40pm at live music venue 170 Russell, on Russell Street in Melbourne's CBD.

"At first I thought someone had spilt their drink on me," Ms Nolan said.