While skinny dipping you dive under water and make sure that your rear end breaks the surface while letting out a fart. If successful this will mimmick a whale blowing out air.
Getting rid of the whales in a group of girls to increase your chances of scoring with one of the more pleasing girls in the group.
Usually achieved by filling the whale/s with enough booze to cause passing out, or by handing them a McDonalds coupon for a value meal down the street.
Hot girls always have whalefriends at the club so me and the guys went whaling and cleared them out so we could get with the babes