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The inverse (x^-1(to the -1 power)) of the question marks... this is rarely ever seen since the ^ key is so annoying to look for, unless you already know what it is. The actual meaning is not as well known; but it is easily either

1)coming from someone who in actuality has no questions
2)coming from someone who wants someone to ask them a question so they can look smart
3) coming from someone who really has absolutely no idea what's going on at all (like towlie)
1:
Person A: does everyone understand?
Mathgeek3.15: ?^-1

2:
Person A: does anyone have any questions?
SuperEgo914: ?^-1

3:
Person A: everyone got it?
StonedEinstein12: ?^-1
by Panthean April 12, 2008
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When you meet with someone without anyone knowing except you and the person.
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