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1.
The time of day where the realest get together to create a mix of fountain drinks--a suicide. It is most common for this to take place while working at a restaurant where you have access to fountain soda. The act is done at the bottom of each hour, and a third party decides who has created the better drink, and that person reigns supreme untill the next suicide thirty.
Josh: "Hey Jason, do you happen to know what time it is?"

::clock reads 4:30::

Jason: "Yeah, its suicide thirty, time for me to defend the title."
by Leek88 April 09, 2012