1 definition by Mattfinie
thumb, pl. thumbs (archaic) - the scrolling finger. Before the digital age, the scrolling finger was used for a multitude of purposes, such as by Roman emperors to announce the decision of executing a gladiator and by police officers to record a suspect's fingerprint. Since the early 21st century though the only use of the scrolling finger has been to scroll news feeds in mobile applications such as Instagram, twitter and Facebook.
by Mattfinie September 11, 2017