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To agree with. This term is mostly used on message boards.
User1: DAMN! J.Lo gotta fat ass!

User2: Co-Sign
co-sign by neqquah July 23, 2005
1. Slang. (positive) - to propound; to sanctify; to advocate the genuineness/veracity of another's character.
2. Slang. (negative) - to A.)acknowledge and accept partial responsibility for the presence/actions of another person and the effects thereof, or B.)to deny all responisbility and/or attachment to said individual and/or their actions and any effects thereof.
1. (positive scenario - your friend's party)
"Who's the dude you came in with?"
"Oh, that's Keebler. Don't worry, man. I co-sign for him. He's cool."

2. (negative scenario - some random party)
"I think your buddy's about to get his ass beat."
"Who said he's my buddy? I just walked in next to him, I didn't co-sign for him."
co-sign by .over.the.stars. July 29, 2008
A Slang Word Meaning "Vouch", When You Get Someone A Job Where You Work. If The Person Is Working Out Then The "Co-Signer" Usually Takes Credit For The Employee's Success(Behind Their Back Usually).
Justin: "Holy Shit, My's Like The Best Employee We Got, Including Myself, Look All The Work He Did Last Night By Himself!"
Tommy: "Yeah, That's Right I Co-Signed That Kid."
Co-Sign by Ibble February 27, 2005
To allow other people to have sex with a person you have had sex with. Term can range from a hook-up to an ex.
Man do you want her? I co-sign her.

OR

I’m into her. I don’t co-sign anyone fucking her.
Co-sign by Wackboysouthere July 31, 2018
v.
1. to represent a cause or opinion by attaching your name and reputation to it.

See also, "to n'th this," as in, "I second this," "I third this," etc..
"Co-signed, because that was some real shit you just said."
co-sign by soweli babale May 3, 2026

Deadman's Co-sign 

**Deadman's Co-Sign**

_An artist in the music industry using the death of another artist to capitalize on their legacy for personal benefit._

**Common Motives:**

- Growing their brand
- Increasing streaming numbers and album sales
- Generating sympathy or good publicity

**Common Methods:**

- Releasing music featuring or remixing the deceased artist's work
- Purchasing or obtaining rights to incomplete projects of the late artist, then revising and distributing them as collaborations
- Publicly pretending to be deeply affected or grieving, resulting in sympathy streams or positive press
1. "I feel like it's mad disrespectful that XXXTENTACION didn't even know Lil Nas X before he passed, and yet Lil Nas X still used him for the Deadman's Co-Sign."

2. "It's pathetic that Drake really thought he'd get the Deadman's Co-Sign off 2Pac by using his AI voice model in the diss track on Kendrick."
Deadman's Co-sign by Worgrimm January 22, 2025