To wash the hands and forearms very thoroughly, as for surgery. To scrub in implies the use of a brush (and often an implement to clean under the nails). To scrub in, to scrub up, and to scrub are synonymous.
I'm not going to scrub in for surgery.
Do you want to scrub in for an appendectomy ?
In a hospital setting, it is when a male wearing scrubs is suddenly overwhelmed with an erection, largely due to a attractive female employee displaying her attributes on purpose or otherwise.
1. Tell someone to scram
2. Insult your friends nicely
3. Tell a Leopard to get back in it's shrub if you are ever stuck in the forest.
Hey man, you're being a bitch to me.
"GET BACK IN YOUR SHRUB!"
If a Leopard ever comes out and tries to kill you, simply say "GET BACK IN YOUR SHRUB" and it will turn on it's heels and run to the nearest bush! CAUTION: Don't try that at homekids.