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A set amount of RPMs which your engine can put out before you pretty much blow it up. This is usually where your numbers on your tachometer start turning red, just be sure to keep it out of the red or else $$$$ will be needed. For instance, the redline on my 95 Jeep Grandcherokee is 5,300 RPMS that is exactly where they start turning red, some cars have a rev limiter on them, so due to my rev limiter the engine will not go past 5,300rpms and the engine starts "bouncing" meaning the needle will do the same. I advise you not to try this.
Dude your not supposed to shift while ur racing till you redline it
by Ryan April 07, 2005
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The branch of the CTA's elevated service that runs from Howard Street to 95th/Dan Ryan. It includes a subway portion inside the Loop.
I took the red line to the Cubs game last night. And of course they won.
by mark hammond August 19, 2005
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(noun, verb)

An informal sketch over another person's piece of art to point out and correct flaws, especially in anatomy. The sketch is usually in red.
"This piece could really use a redline."

"Could you please redline my drawing of a hand for me, the proportions are off."
by xSilverSky June 29, 2009
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Using an app such as Kikfriends to troll your friends (or someone you don't like) done by, posting their kik along with the photo of an attractive female. Thus, causing a giant wave of thirsty dudes to spam their phone.
Daniel: Hey Karen, I've been getting a bunch of strange messages lately D: (Lies)
Karen: Oh my god, I have too I've gotten 52 messages in the last half hour
Daniel: CHALLENGE COMP... I mean Hmm, I wonder why.
Karen: I KNOWWWW ! (Oblivious)

Later:

Fernando: Did you redline her ?
Daniel: To the max bro...
by CARACK man July 25, 2015
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5
The Canadian version of second base according to robin in How I Met Your Mother. some would say it's feeling up (boobs or ass), while some would say it's a hand job or fingering. all you gotta do is determine what "league" your "playing" in.

red line in house league is just feeling up (with or without cloths)

red line in AAA or NHL is hand job or fingering

House league: blue line; making out, red line; feeling up, offensive blue line/offensive zone; hand job/fingering/oral, in the crease; sex

AAA or NHL: blue line; making out with feeling up, red line; hand job/fingering, offensive blue line/offensive zone; oral, in the crease; sex

other great things come with this hockey-sex metaphor like:
-wrap around (doggy style)
-to many men on the ice (double team)
-assist is for the wing man
-pulling the goal tender (no protection)
-home ice advantage (being at your place)
-hatrick (scoring 3 times in a row)
first example:
Mike-dude i got to the red line with Sarah!
Alex-what league were you playing in?
Mike-NHL man!

second example:
Mike-great assist last night man!
Alex-oh ya how'd it go with you and that chick from the bar?
Mike-i got right in the crease!
Alex-awesome, how'd you score?
Mike-i pulled a wrap around.
Alex-you didn't pull the goal tender did you?
Mike-of course not. but i did get a hatrick!
Alex-right on!
Mike-ya it was legendary! must have been the home ice advantage
by crazybobbobbob October 30, 2011
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6
To do something that scores major disapproval and/or anger. To many motor-heads, this term can be used perfectly, as it correlates with "redlining" on a car motor with RPMs.
"Dude, you slept with my sister. That's such a fucking redline."

"You're redlining right now and it's really pissing me off. Cut it out."
by LSXJunkie October 04, 2009
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A name given 2 A popular and VERY potent strain of marijuana during the late 90's and early 2000's . Found in and around the NYC metro area.
Man 2 pulls off that Red Line had me high as a kite !!!
by Joey Botts jcnj September 08, 2010
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