1 definition by LSXJunkie

Top Definition
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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