Pen spinning refers to the action of using one's fingers to manipulate a pen in aesthetically pleasing ways. This is done through the (hopefully seamless) combination of various tricks. A single trick might be balancing the pen on one's thumb as it spins several times, or weaving it between one's fingers in a circular motion.
KBoopaloo: @wizbiff Awww, poor Elizabeth. Maybe the shirt felt uncomfortable coming to Boston where it knew your head would be spinning.
ICEMIKE1200: RT @urbanunionradio: spinning:@FIENDFAMONEY [Fiend- Roll That Light That ft Corna Boy P] at http://tobtr.com/s/809509 or call 646 595-39 ...
seaniewill: @thecultureofme I meant bags of records. Almost everyoe was spinning vinyl. Jenny and I were Them during the day.