said to give encouragement to a person dropping mad knowledge.

One who has a mania for music.

"Preach" has 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,

Or to indicate that something has impressed you favorably.

Its usage among young blacks has been parodied ad nauseam among clueless suburban whites.

Seamore .... speak..... preach…….

What teenage girls say when their friend shares a mildly inspirational image on Instagram, usually followed by 3+ emojis.

Same as "amen", as in "amen to that", but sounding cooler. Was widely used around 2005, then got old.

according to snoop dogg, when something good happened or u feel good, u say "Preach!" as a emotional expression.

1) Speak your mind!
2) religious term - Kirk Franklin keeps it real.