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Running a piece of equipment, most often an engine or other powerplant, way beyond it's rated maximum, usually in an emergency situation.

Usually, denoted by taking the engine revs or temperature up into the red area on an indicator dial, risking permanent damage or catastrophic failure.

"How fast will that thing go ?"

"One fifty five, but after one forty you'll be redlining"
by Eighth of Seven January 07, 2007
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Also skating on thin ice. To be in an unfavourable position of being one step away from having a superior party devastate your cause.
I'm seriously red lining it with the boss man. He says I'm one step from having my shit ruined. I know what he's like. he will seriously fuck me up.
by Kung-Fu Jesus April 20, 2004
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From redline -
Pronunciation: 'red-'lIn
Function : verb
: redline, to redline, also redlining; to engage in sexual intercourse at an extremely rapid tempo.

Origin in redline : a recommended safety limit; the fastest, farthest, or highest point or degree considered safe.
Hank said he was redlining that bitch for an hour.

After redlining that bitch, she could barely walk.
by Ciao [Scum Crew] April 03, 2006
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