An entry level sex act designed to denigrate a female while qualifying as a popular double points finishing move for men. To participate in Sperm-Whaling, a man begins by gently ejaculating into a females mouth so as not to arouse her suspicion. Then, without warning, the male quickly yanks the back of the females hair in a downward motion so as to elicit a surprise factor while simultaneously orienting her mouth toward the sky. A brisk gut punch from the male finishes the maneuver as it sends his sperm shooting out skyward from her mouth just like a whale clearing its blowhole when surfacing.
Hey bro, Do you see that stuff on the ceiling? I had Becky over last night and I went Sperm-Whaling!
Another word for masturbating or "jacking/jerking off"
A: Whaddya gonna do when you get home?
B: I dunno. Maybe fish for sperm whales, play some CoD, the usual.