Wiktionary
casual fridays
n. (plural of casual Friday English)
Usage examples of "casual fridays".
Special Agent Myers leaned back in his chair (casual Fridays) and templed his fingers.
The leather pants, red ankle boots, and the spaghetti strap halter weren't too far from what I usually wore on casual Fridays to tick off my boss, but put them on a street corner at night….
Four pairs of gray suits and a Hawaiian shirt he wore on casual Fridays.