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2.
Having a fulfilling sexual fantasy (often in the shower) involving The Shannon.
Last night was difficult. I couldn't sleep at all, so I had a nice Shantasy and i went right to sleep!
by rongoms March 15, 2011
 
1.
A lurid fantasy usually involving football, unrequited dancefloor gyrations and exotic international travel.
I can't believe I won Shantasy! We need to go on a Shantasy to Goa later this year.
by bootyshaker4000 September 20, 2013