Definition from Wiktionary, the free dictionary
Almost certainly a shortening of "the old school of thinking", "an old school of thinking", "an old school of thought" or some similar phrase.
- (informal, idiomatic) Characteristic of a style, outlook, or method employed in a former era, remembered either as inferior to the current style, or alternately, remembered nostalgically as superior or preferable to the new style, the older denoting something that would be considered out of date or out of fashion to some, but as such, is considered by others as cool and hip.
- That teacher's old school methods aren't effective, they're just annoying.
- Man, I love that jacket; it's so old school.
- (informal, idiomatic) A style, way of thinking, or method for accomplishing a task that was employed in a former era, remembered either for its inferiority to the current method, or for its time-honored superiority over the new way.
- Family experts are advocating a change away from the old school, advising parents not to medicate behavioral problems.
- My mom's a good baker because she's of the old school. She'd never buy ready-made cookie dough.
- For usage examples of this term, see Citations:old school.