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1.
the act of two indivuduals venturing into two adjacent stalls in a bathroom to simultaneously deposit fecal matter in sync, and also discuss with each other the matters of life.
While co-piloting Matthew and Thomas were able to express their feelings regarding their views on the condition of each others bathroom stall.
by MTAHTOTMHAESW February 18, 2009
 
2.
When a passenger holds the wheel for a driver while he is lighting a bowl, bong, bubbler, joint, or any other smoking apparatus usually for marijuana
Yo bro want to co pilot for a second while i spark this bowl
by Admiral_Ackbar November 09, 2008
 
3.
an amphetamine tablet
I don't need a copilot to carry in my luggage just because I didn't get much sleep.
by The Return of Light Joker July 27, 2010
 
4.
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.
by sarge3562 August 03, 2008
 
5.
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!!
by MaTtIe GeE February 20, 2011
 
6.
A co-pilot is a buddy who you would take with you while on the prowl for chicks. Co-pilots are generally the substitute for a wingman when one is not available. A common use for a co-pilot is to distract her friends while you make your move. However, a co-pilot can't be granted the same level of trust as a wingman, in the sense that they are usually rookies and have yet to earn their wings. Therfore, co-pilots are a last resort.
Guy 1 - "hey man, I need a wingman for tongiht. You in?"

Guy 2 - "Sorry dude, I have to work early in the morning. Why don't you get your little bro to co-pilot you?
by outforsomeair April 09, 2010
 
7.
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.
by yerboy319 April 06, 2011