The process of making your partner laugh immediately after a blow job so that your sperm shoots out their nose.
"Me and that bitch were watchin step brothers while she was giving me a bj and she totally spermwhaled all over when I was finished"
by Scuba Sam February 26, 2009

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A whale who recently had sex and is currently completely filled with sperm from the other whale.
Look mommy, there's a sperm whale over there.
by Soptactic January 23, 2015

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a large female who has uncontrollable urges for sperm.
"Dude, Jerome, this girl wants my nuts. Too bad she's fricken spermwhale."
by CrotchOtter February 14, 2009

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To get a head in a hot tub from a girl with a trachea and when you are cuming you jam your dick down her throat so that when she comes up from under water she blows your load out her trachea like a whales blowhole.
Curtis: Hey man, I made Tracy with the trachea do the "Sperm Whale"!

Nate: No way, "Sperm Whales" are the shit. Almost as good as a blumpkin.
by Tragicmangina August 05, 2014

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a fat person who wants to be a whore
person 1: dude, i got with hailey last night

person 2: sorry to break it to you man, but she's a sperm whale

person 1: *starts crying* i thought she felt heavy!
by lulzra roflnig October 31, 2011

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When you pick up a woman of bigger size and when having sex with her you put her face down and blow your load in her ass and watch it spray out like a sperm whale.
Jay gave fat sweaty Betty the sperm whale last night.
by The_Only_Freakass November 04, 2010

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1. A Whale that has spermaceti in his head, not sperm

2. A fat man who masturbates for a total of 24 hours in a fortnight (that may not seem like alot but remember that it's a TOTAL of 24hrs. Thats alot) and spews bucket loads of semen
Dave: "Woah! That guy is fat!!"
Bill: "Yeah, but his hands are covered in milk!"
Dave: "Umm... That's not milk, Bill. That's cum"
Bill: "What a Sperm Whale!"
Dave: "Bill, what's that mean, he's a Human!"
Bill: "Oh, it's a word that LemonyStuff invented."
Dave: "Woah, it all makes sense now!"
by LemonyStuff September 04, 2009

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