Pulling A Chapman
To masturbate outside, at night, on your deck or patio. Preferably in cold weather.
David's wife caught him Pulling A Chapman last night.
Pull a Chapman
Injuring yourself in an unexpected yet somehow predictable nature
"Oww, i got up out of my chair, and pulled a muscle in my back"
"Damn, you just had to go an pull a chapman""
"Damn, you just had to go an pull a chapman""