Top Definition
derived from military security levels for access to classified info. i use it on a person or persons who needs permission before they are allowed to speak based on past experiences of saying the stupidest shit you've ever heard; use it especially on those who have a tendency to speak before thinking; i put 5 because thats the highest level i've heard in the army but you can use any number depending on how stupid the remark and your friends or random people are.
after she asked "how do you know when volcanoes are active" anferny and i determined she required a level 5 security clearance before being allowed to ask questions again.
by nani pilikia February 20, 2005

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