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I was watching the movie "When Harry Met Sally" and I had a trouble to understand this highlighted part of their conversation.
Harry: No you didn't. A Sheldon can do your income taxes. If you need a root canal Sheldon's your man, but humping and pumping is not Sheldon's strong suit. It's the name. Do it to me 'Sheldon', you're an animal 'Sheldon', ride me big 'Sheldon'. Doesn't work.
Humping is slang for sex (or similar activities).
The phrase "humping and pumping" probably refers to an Arnold Swhwarzenegger quote:
The best activities for your health are pumping and humping
When he said it, "pumping" referred to lifting weights.
It's not a common idiom but is easily understood.
