Harpoon is slang for a hypodermic syringe.

Medically, the harpoon is described as the rod that is used to push the contents through the needle.
I've got a teener of H, pass that harpoon and we'll do a blast.

Engage the harpoon into the rubber plunger. Use moderate pressure on the thumb ring to push the piston forward until the harpoon is firmly engaged in the plunger. Make sure not to push too far.
by dimebags January 31, 2011
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When you are having a night out and out of all the fish in the sea, you end up with a whale.
Friend1: So are you going to put on your beer goggles and go harpooning for the whales like last time?
Friend2: Fuck you..
by aksdfhksajdhfksadf June 13, 2013
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The battle cry called out to alert members of ones team that a shoulder launched rocket is going to be fired. In reference to the Rocket Propelled Grednade (RPG) looking like a whaling tool on some online applications.

Nick: "Harpoon!!!!"
Matt: "Oh thank god you said that or it would have hit me!!!"
by Bitter Bacon March 26, 2008
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What you man when whales (land and sea) approach.
ZOMG look at that bitch waddling over to us! Where are teh harpoons, man them!
by StrizzMatik February 17, 2010
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It's when you go out to the bars with the intent to bring home a women that resembles a whale. Usually you are in a drunk state of mind or you might just be into big women. In any case get out that harpoon and nab yourself a fatty.
Tonight is going to be a great night I'm going harpooning downtown.
by Joseph horn October 5, 2009
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A term often used for, when a piece of garlic has fallen on the floor and you step on it but your parents usual dry cleaner lady’s cat has died and instead of getting it cremated, they just shoved it in there oven for 567 degrees Celsius.
Omg Jenny did you hear about Joehanus’s Harpoon Incident?
by bussylicker647 May 7, 2021
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A game played at a nightclub where a group of guys competes to pick up the biggest girl at the bar
While doing some Whale Watching and harpooning at the club with the boys, I set my eyes on the prize:

Get your harpoons out boys, I’m about to land a 600 pounder
by Denna123 January 16, 2022
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