A very arduous task. A job that is very strenuous, and takes a long time to complete or even to attempt.
"Write a 5000 word essay? What a mission!
by NZAzN K' October 19, 2003
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the act of going somewhere to have sex with a chick, usually used when running a train
Im bouta go run a mission on dis hoe that jus moved down the street. Ya'll comin?
by mikejones July 1, 2004
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Using the public transit to go someone's house/to an event
"Hey are you guys going to Franny's?"
"Yeee, bro. We're missioning it there."
"Seriously?"
"Shelay"
by Gina Un-Failure June 23, 2009
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Spanish quarter of Frisco. Where you can get a taco and a greencard from the same shop. Like East LA. 24th street is the Nortenos, 20th-18th is the Surenos and 16th street is the crack heads and potheads.
Where you from homes?

24th and mission, fuck 18th scraps
by Hyphy_Crunk_Pumped_Amped August 28, 2005
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Originating in Scituate MA and often referred to as "Scituate Slang", a 'Mission' is when one person will hit up another (that they like, think is hot, etc) trying to hook up with them in a car or other sketchy spot. Missions are most likely take place In a parked car in a sketchy dark parking lot. This word has swept through the town and everyone knows the classic 'Mission Spots' where someone can take that significant other on a mission.
Joe: "Dude guess what? Me and Jessie missioned last night"

Cam: "Yo really? Where'd you go?"

Joe: "Ant Hill... Didn't get buffs or anything just a hook up"

Cam: "that's a classic spot bro... I'm surprised you didn't get bopped by any mission hunters"

Joe: "True"
by MikeDiddlyP April 12, 2015
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travelling back and forth to many places
We missioned it to t dot on saturday.
by charisse March 27, 2003
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A hard or unnecessary task to fulfill.
Okay, but this is going to be missions.
by bubblepop August 2, 2006
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