Word used to describe someone who sleeps with large women that are of whale proportions. The person will often take a huge disliking to this comment which is usually intended to offend the person.
Gav: "Hey Tommy, what about that fatty you slept with on the weekend, you whale rider!"
Tommy: "Hey Gav, how about you shut your mouth or i'll put my foot in it"
Crowd: "Ohhhh Tommy!"