Top Definition
an obscure euphemism for, like, a really fucking critical moment. as in, if someone says "you'll know when" well when you have twenty minutes of oxygen left is prolly a pretty good indication of "when."
"yeah, so when i only had twenty minutes of oxygen left I figured it was pretty clutch and remembered when my future self said "youll know when" and figured it was pretty much when, so i wnt for it."
by thanethedane August 21, 2008
5 Words related to twenty minutes of oxygen left

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