To have meaningless sex. Refers to "dumping" ones dick in any or all orifices on a girl.
Example 1

John: Hey Andrew what do you think of the new girl?

Andrew: She's not the greatest , but I figure after a six pack I'd dump it in.

Example 2

She wasn't the greatest looking, but I figured I had 20 minutes to kill so I might as well dump it in.
by johnny5ive August 16, 2011

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