TGIF (TV programming block)
TGIF was an American prime time television programming block that aired on ABC at various points starting in the late 1980s. The name comes from the initials of the popular phrase "thank God it's Friday"; however, the stars of the lineup touted the initialism as meaning "Thank Goodness It's Funny." In its various incarnations, the block mainly featured situation comedies aimed at a family audience, and served as a lead-in to the long-running newsmagazine 20/20 (which has been part of ABC's Friday-night schedule since September 1987, two years prior to the original launch of TGIF).
Source: Wikipedia — TGIF (TV programming block) (CC BY-SA 4.0)