To pop the spinach means that during the act of shoulder deep anal fisting. The fister eats a can of spinach like popeye which causes his arms to significantly grow in size. Providing greater pleasure/trauma to the partner.
Okay , I'm all the way in. Let me know when you are ready and I'll pop the spinach.
by goldfishhotel March 19, 2016
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A term of endearment, meant only for those hardcore couples that partake in shoulder length anal fisting. Upon fully insetting ones arm one of the partners, predesignated of course shouts “pop the spinach.”

At this point the shoulder length party ingests a can of Spinach and similarly to Popeye; the arms grow significantly in size cause extreme pleasure/trauma/ pain to the one recieving the pounding.

Once conceived the one receiving the pounding may yell “another one”
Carmen was sweating profusely, Dave’s whole arm was in her. Her eyes widen when there heard the loud pop. “Pop the Spinach!” Dave shouted. That was the last thing Carmen remembered passing out from an immense wave of emotions.
by peteshus March 19, 2016
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