Whilst manipulating the scrotum with your mouth, shake your head back and forth making a "motorboat" engine sound.
It's the male version of the motorboat.
Last night, Janine was circumnaviagting my scrote and then she went crazy and scroterboated me. I may now marry her.
Proteome Systems Ltd (ASX:PXL) today announced the signing of an agreement with the New York based biotechnology company, Egenix Inc to co-develop a scroteome-based (semen-based) diagnostic kit for prostate cancer based on the known proprietary Human Carcinoma Antigen (HCA)