popping one off 

The act of masturbation to orgasm.

After drinking coffee in the evening, I can't fall asleep easily without popping one off.

popping one off by Bluthuf November 9, 2013

poppin' one off 

a euphemism for male masturbation
usually a "quicky"

Guy:man it doesnt take that long to wash your hands, you poppin' one off?
Other guy: it's only been 2 minutes
Guy:exactly

poppin' one off by metrosexualbastard August 18, 2006