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8.
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
 
9.
A woman's panties during her period
If you don't go with kotex during that time of the month, you will redline.
by 4ngryToasters March 27, 2010
 
10.
When a woman is on the "red line", it means she is menstruating or having her period
Don't mind that moody cow, she's on the red line...
by Serious bellend January 30, 2011
 
11.
when your waiting for the red line to load on you tube!!!
for fuck sake red line loadddddddddddddd!!!
by lara brown May 16, 2007
 
12.
The coolest line of BMX bikes during the 80s.

Check out that dude's Redline. It's as rad as Tubbs and Crocket.
The guy riding the Redline kicked all the other douches' butts in the race.
by Mr. Redline August 07, 2006
 
13.
A brand of synthetic automotive lubricants.
There is a bottle of Red Line oil sitting on the tool cabinet at the background of one of the Debra Lafave posing pictures.
by TObject September 09, 2005
 
14.
When somebody has made you really angry or upset.
Shes crossed ma redline blud!
by Foreign May 09, 2005