To have unprotected sex with your peanut butter jar.
John: What are you gonna do this friday?
Tim: I'm gonna do a "safe peanut butter friday".
John: wdym by that?
John: What are you gonna do this friday?
Tim: I'm gonna do a "unsafe peanut butter friday".
John: wdym by that?
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.