General
up to 90
What does up to 90 mean?
Run off your feet, manic, going at full tilt. The 90 is mph on the old speedo — you're redlining. Usually said when you're snowed under and need everyone to know.
"Don't be ringing me at work, I'm up to 90 in here."
Origin
Hiberno-English idiom, motoring metaphor — 90 mph being flat-out on Irish roads back when speedos topped out there.
Frequently asked questions
What does up to 90 mean?
It means flat out — going mental with how much you've got on your plate.
How do you use up to 90 in a sentence?
"I've been up to 90 all week trying to get this finished."
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