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Someone who does something wrong or against the rules for a long period of time and then quits and tells on others doing the same thing.
Adam: "Dude, both me and Dave took off 10 sick days last month! This month hes decided to be good about it and now hes ratting on me for calling in sick too much!"
Josh:"Wow dude, hes just being a Canseco right now. He got what he wanted out of it and now hes the informant"
Canseco by Cheezedadadada January 26, 2010
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A paid informant. No one respects them, except tools. Used as verb or noun or because of lack of self-respect and/or trueness to the game.
Ronnie straight-out canseco-ed Sean and Dustin i.e. he is a straight punk-ass canseco bitch.
canseco by the ocelot February 1, 2006

Canseco-Mode 

-adjective

1. To disclose confidential information about former associates.

2. To publish defamation, typically about friends/family.

-verb

3. The act of double-crossing.

4. Informal - a person who abandons or betrays his or her party, esp. in a time of trouble.
Hinkley went Canseco-Mode and got everyone on the Band Trip suspended.
Canseco-Mode by Blue Calloway August 6, 2010

Jose Canseco 

A fucking cuntbag that squeals on steroid users in MLB just to make himself, an admitted steroid user, look better
My friend turned into Jose Canseco and now everybody hates him becasue he's a douche bag.
Jose Canseco by angelos h8er September 7, 2008

Jose Canseco vitamins 

Steroids, an illegal substance usually used for performance enhancement.
The report named everyone on those Jose Canseco vitamins.
Jose Canseco vitamins by Bej34 January 28, 2008

Blosé Canseco 

Blosé Canseco:

The act of receiving fellatio while simultaneously injecting steroids
Walked in on my roommate last night and his girl was blowing him as he injected...”

“Sounds like you caught him pulling a Blosé Canseco”
Blosé Canseco by Peterporker March 18, 2019

consecotaleophobia 

jake: ive consecotaleophobia
nehal: chopstick
jake: STFU
nehal: chopstick chopstick chopstick chopstick chopstick chopstick chopstick chopstick chopstick chopstick chopstick chopstick chopstick chopstick chopstick chopstick chopstick chopstick chopstick chopstick chopstick chopstick chopstick chopstick
*jake has left the conversation*