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A time-period occuring weekly between friday afternon and saturday morning. This time is usually spent in an intoxicated state prefferably among other people.

The expression is commonly used among students to help plan the start of the weekend.
-What are you doing this swiday?
- Me? ...Probaly the ush, play some beerpong and drink too much.

This swiday is going to be rad!
by DanneMuttan September 27, 2011