Euphemism for male masturbation. Coined (or at least made popular) by Ryan Stiles on Whose Line Is It Anyway.
"Sorry I'm late. I was choking the nun...if you know what I mean."
by Chemical Castration January 01, 2012
Stroking the male genetalia repeatedly.
"I love choking the nun every night"
by nicholas charlie March 01, 2005