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1.
To have ones penis sucked. Blowjob
...with the really tight mouth gave me a derve last night.
by AngryJ May 10, 2008
 
2.
Derve is an alternative word for alcohol. It can also be used to describe the consumption of alcohol.
"You on the derve tonight lad?"

Michael: Live to derve
Ben: Derve to live
by Dervetbh January 11, 2012