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Euphemism for masturbating. Reference to in the movie "Something About Mary" in which Todd has to "prepare" for sex with her by beating the dolphin to get his confidence up. It is a common euphemism used by high school teens that go to the bathroom at school to jerk it.
Johnny: I'm going to beat the dolphin right quick.
Jacob: Haha what a fucking loser
Johnny: (to teacher) Can I go to the bathroom?

Teacher: No, sit down and shut up. No wanking during my class
Johnny: Shit.
by RoyalYoshi July 20, 2016
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