Same as "amen", as in "amen to that", but sounding cooler. Was widely used around 2005, then got old.
Chick 1: "Justin Bieber got so manly!"
Chick 2: "Preach!"
by KenM September 21, 2015
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when 2 people, whom refuse to admit that they like eachother, are flirting.
Tom and Ruby were talking to much, Preach.
by ssheeeeesh March 10, 2023
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according to snoop dogg, when something good happened or u feel good, u say "Preach!" as a emotional expression.
by wcwy1228 January 29, 2008
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There is no single meaning, but is used to convey a casual sense of affirmation, acknowledgement, said in agreement, something that is real, absolute, well said, a person dropping mad knowledge while unconsciously projecting who they are onto others and exposing him or her self as a hypocrite.

Or to indicate that something has impressed you favorably but everyone really knows the person doing the preaching is clueless and talking out of their ass.

Its usage among young blacks has been parodied ad nauseam among clueless suburban whites who actually do have a clue and calling out their counterpart who are the ones who actually have no clue.
Schnoup says... "man, what an ignorant piece of trash..."
Dawg's response... "preach..."

Elmer... "You are the one who obfuscates damn near everything, so you can soothe your self-righteous ego. You like to do that, so you can twist the conversation back to your positions and try to put the others on the defensive. Few exceed your mastery of that kind of arrogance - truly."

Fudd... "preach."
by theycallmepseudonym January 12, 2014
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Normani outsold all of your faves with"Love Lies"
PREACH!
by Normanilovelies April 1, 2018
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It means sure, which is used widly used by Snoop Doggie Dog.
-Yo man, let's go get some KFC!
- Preach
by MarkoE500 December 11, 2006
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