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1. Copilot
When you are peacefully taking a shit in a public or workplace bathroom with a row of stalls and someone comes in and takes the stall right next to you.
Zach was droppin a duece at work, reflecting on his day, when Jeff came in and copiloted him.
2. copilot
similar to wingmen, when two guys go to a bar and they help each other hook up with desirable girls. In biology this would be similar to a mutualistic relationship in which both organism benefit each other.
Steve and Tom are going to a bar but they are copilots instead of wing men so neither of them will have to flirt with a fat chick to help the other hook up with her hot friend.
3. copilot
When you are driving and need both of your hands for something, the passenger can be asked to take the wheel while you do what you need to do. Can be used as a noun or verb.
Friend 1: "Hey, do you want a hit this bowl?"
Friend 2: "Sure, can you copilot for a sec so I can light it?"

"I thought I was gonna get pulled over because I was swerving all over the road, but my buddy is just a bad copilot."
4. copilot
When one gay man jacks off another gay man. Usually misconceived as another mans best friend.
Wow my copilot helped me so much last night!!
5. Copilot
when a Sheena goes fancy and "journals" at B&N to the wee hours of the night.
Gurll, that sheena be copiloting all night.
6. copilot
an amphetamine tablet
I don't need a copilot to carry in my luggage just because I didn't get much sleep.
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