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2.
The depressed day (or days) you have in the 72-96 hours after ingesting ecstasy. (Does not have to actually be a Tuesday) How it came about: Most people who go to school and/or work but who use X will pop a pill on a Friday night and party until Saturday. The imbalances caused by the massive release of serotonin while using the drug causes your receptors to temporarily malfunction and by Tuesday one is usually feeling inexplicably sad or depressed.
I wondered if it was my Blue Tuesday that made sex so awful for me, that evening. Technically it was spot on, but I couldn't get my head in the game and really enjoy it.
by The Inky Kitty November 24, 2010
 
1.
The purpose of a Blue Tuesday event is to refer to an actual event without disclosing any actual information of that event. As such a Blue Tuesday is an event that may or may not occur on a Tuesday and may or may not involve the color blue. Somewhat Similar to a surprise party, except people are limited to knowing it exists, and know nothing else about it.
Tim (to group): so about Blue Tuesday-
Sarah: whats blue tuesday?
Tim: you don't know about it, thats kinda the point.
Sarah: fuck you tim
by gordonamue April 04, 2009