Most commonly used in reference to doing one a favour. Otherwise used to refer to a massive turd that David takes in your toilet and films on his phone.
1. Hey man you wanna do me a solid
2. David I'm sick of you doing a solid in my upstairs toilet!
by mrpain July 24, 2008
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(noun phrase) 1. A deed done usually for a close/good friend and understood as a favor; 2. A compacted bowel movement free from any signs of liquification; 3. The production and further application of an impressively hard/erect penis/cock that is both visually and physically quality material and most pleasurable to the recipient.
Bartering on her investment and hoping to get a fair deal, the young lady got in on a sweet deal. She had ended her request with the well worn words, 'Can you do me a solid on that?" The voice on the other line, clearly Nikki's, told her in no uncertain terms, "Little girl, I'm gonna do you a solid, and then I'm gonna double it cause this needs to happen for me for sure. First off, the weight will be there---no worries there. That's your first solid, dig. The other solid, now speak now or forever hold your ankles high. I mean the other solid that'll be coming with the first one is this FUCKIN' rock-hard, totem-pole cock of mine that's practically ripping through my jeans right now at the thoughts of how I'm gonna whoop your ass when I put this cock to you. So dolid's being done for you tonight, twice guaranteed. If you require more...... ask. I'm heading in your direction now, girl".
by Nikki Stixx November 26, 2021
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The phrase "do me a solid" means do me a favor. The term was first used in the Northeastern United States, particularly in urban environments, at least as early as the mid 1980's, long prior to the Seinfeld episode usage.
Do me a solid man, lend me $5.
by Jonnyanthology August 17, 2013
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Hey, man, do me a solid... Yeah? Lend me a fiver...

my comment: Seinfeld, schmeinfeld, we were using the expression "Do me a solid" mid-sixties in London. But I don't know where it started.
by TeeDubbya May 11, 2014
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First used on the Seinfeld episode "The Jacket" in 1991.

KRAMER: Hey. Hey, would you do me a solid?

JERRY: Well, what kind of solid?

KRAMER: I need you to sit in the car for two minutes while it's double-parked. I gotta pick up some birds.

Also used in the movie "Half Nelson" (Ryan Gosling)

"Juno" has caused a new wave of youngins to say this who have never used the term before seeing the movie, which has caused people who have used it prior to stop using it immediately. Take the term you fake ass scenesters.
by old head April 4, 2008
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"do me a solid" means do me a favor.
I want to date this hot chick but she wants to bring her not-so-hot friend. Can you do me a solid and go out with her friend? The phrase is used by Jennifer Aniston in the movie "Derailed."
by Punk Ass Bitch September 5, 2006
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a solid is when you ask for a favor and by doing so you owe them a solid (favor) as well/
Hey can you do me a solid?
You do realize you owe me a solid as well if I say yes, right?
Yes
by Darkslayer543 February 21, 2017
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