What is knock one off?

To have sex or at least reach orgasm in a restricted amount of time.

When I wake up in the morning the gf and me knock one off before I go to work.

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knock one off - video

Knock one off - what is it?

1. Make love to yourself
2. A bout of self help
3. To masterbate
4. Pull the popes cap off

Dont go to the shop yet sugar, I just need to quickly knock one off.

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