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1.
A transfer of a problem from person to person.
Rather than taking a trip to the post office, the stamp-lacking asian asked her friend to drive over to her house and bring her stamps. She passed the buck to him.
by Johnny Rocket January 02, 2004
 
2.
When, during intercourse, the partners exchange food through each other's mouths one or more times.
Last night we decided to pass the buck with strawberries dipped in chocolate. After we chewed a little, it was just mush. She has such a food fetish.
by GMane July 21, 2008