When you put peaches in a girl's vagina and either whipped cream or iced cream on a man's penis, then proceed to sixty-nine for a minute, then rotate and kiss each other, forming peaches and cream in each others mouths.

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When an old man goes to a parlour and has his bald head buffed until shiny.

Inasmuch as sex, a peach melvin if you will can also regard the orgasm of a large farm animal. I.E: Horse, Cow, Moose, Teridactyl