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1.
A sexual party in which 6 or more male and/or female participants gather on a Harbor or Port and partake in various sexual acts typically including sexual intercourse, anal sex and oral sex.

(Though usually taking place in the middle of the night, it is not uncommon to see a lobster party happening in the morning afternoon or evening.)
Jake: Would you like to attend a lobster party at midnight?
Anthony: Thank you but no thank you, I fear i would turn the event into a crab party.
by BigBigWilly December 08, 2009