when one stretches his cock with this index finger and thumb and pulls the tip up as far as it can stretch without ripping off
you guys wanna see a magic trick”?
“no gerry we don’t wanna see the extendo again”
by daddycoley March 20, 2019
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Slang terminology for an extended magazine, typically referring to a 30-round magazine for a Glock 17 or 19, also known as a happy mag.
Niggaz be slumpin' after I hit them with the extendo clip.
by Munchma Quchi () October 4, 2015
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A long shlong.

Or a shlong which becomes long.
"Hey Fred, Do you have an Extendo-penis?"

"Of course I do."
by Dathom September 25, 2023
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An individual who you only socially interact with when a mutual friend of both of you is present. Without the link holding you two, you both have no reason to talk making it awkward with out the friend.
"Hey! Have you heard from Nina since Matt's birthday party?"
"Nah man, she's an extendo friend to me. I don't really know her."
by ffffffffffffff3343555 March 23, 2017
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1) Any device/pill that increases the size of the penis.

2) An object such as a dildo, remote control, plastic bottle, or anything else possibly used in place of the actual penis, to simulate sex(usually by a male that "will not touch that stanky ass pussy", or a lonely female).

3) A glorious gift that few possess that enables a male to get an instant erection on demand, regardless of the time or place.
1) Phil: "Hey man can I borrow some extendo-dick pills like Cialis, Viagra, Levitra, Extenze or somethin like that?"

Jeff: "Sure. Why, you got a date?"

Phil: "Nope, just wanna try it out."

Jeff:"...."
2)Jeff: "I couldn't bring myself to fuck her without a condom, so I just bent her over and used the DirecTv remote, and went through the motions... And by some miracle I tivoed I Am Legend with Will Smith."

Phil: "What, Jeff? I wasn't paying attention. Your remote's buttons are stuck."*smacks on couch* "Maybe i can bite it..."

3) All that cock push-up training really came through when i got laid in an elevator by pushing the button of the girl's floor who came in after me... with my dick. Thank you extendo-dick.
by SleepFaster January 12, 2012
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When you extend your pee pee to get that boi pooosay
Hey boy i'm about to extendo fag yo ass
Boy: YES MOMMY
by Mommyhole August 26, 2018
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While watching Harry Potter, with or without a female companion, start getting an erection and shout EXTENDO WANG and she will NOT* turn down down a chance to be with a wizard.

*Not proven.
fred: *half way through a full erection* EXTENDO WANG

beverly: wow fred that is truly magic let me touch it please
by catfish22 February 7, 2014
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