A bribe.
He tucked a little brown envelope into the guys top pocket.
An incorrect version of "interoffice envelope" that people say or email to the entire company when one is missing and contains the documents they need.
Random office worker: Can everyone please check to see if they recieved an inner office envelope that should have come to me.
Jay: OMG! Someone did it again.
Theresa: *sigh*
get a movie in the mail from netflix
John Doe: what did you get in the mail?
Jane Doe: red envelope.
John Doe: what movie?
Jane Doe: only the greatest movie of all time, Ferris Bueller's Day Off.
A day that is entirely taken up with necessary but mind-numbing administration, usually to clear the decks so you can get on with the stuff you're supposed to be doing.
"If I don't get this tax return done today, my head won't be clear enough to finish Ulysses. Time for a Brown Envelope Day." --James Joyce, Trieste, 1921.
An envelope made of brown paper.
"Yo dawg, this bitch sent me a brown envelope with a letter on the inside!"
The act of ejaculating inside ones boxers while worn then forgetting and having your load dry to your thigh. Usually the result of a parental invasion without knocking or late night jerk session.
"Brad, why did you run off last night after we finished dry humping?"
"Oh I just had a Crusty Envelope Sealer I had to open."
Practice in journalism where journalists are given money in envelopes so they would write favorable reports about the person giving them money. It's another term for payola.
Envelopmental journalism is practiced by corrupt and greedy journalists.