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1.
An initiation ceremony where the person must drink screech rum, kiss a cod and speak some Newfoundland slang. The participant then becomes on honorary Newfoundlander.
We screeched in the mainlander lastnight.
by Newfoundlander July 25, 2004
 
2.
To have wild crazy sex.
I just screeched that fine girl.
I saw her screechin your cousin.
Get your screech on.
by white rose September 28, 2006