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.
by Frank Lard May 19, 2007
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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.
by gerf June 5, 2004
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1-made you fall down
"i knocked her off and she hurted her arm"
by ZoZi July 13, 2005
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When a man (usually younger) has sex with a woman (usually older) who hasn't had sex in a long time
She said it'd been a year since she'd had sex. But I'll still knock the dust off that pussy!
by metallicafan3124 January 19, 2015
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To take one of those really hard fast and sometimes (unfortunately) dry dumps. The only bonus to knocking a shard off is they leave the shute clean. One wipe and you are diddly done!
I sat down hoping to post a stump and ended up knocking a shard off.

Sometimes my girlfriend will run out of the room because she has to knock a shard off.
by projectmatter July 15, 2009
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i knocked a bag off on your mother last night and she loved it.
by twow October 17, 2013
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