Originally a martial arts term (a set sequence of moves). In modern slang, it means a predictable trick or manipulation: 满满的套路 (full of tricks), 城市套路深 (city tricks run deep). Very popular internet slang.
culture
The internet catchphrase 城市套路深，我要回农村 (City tricks run deep, I want to go back to the countryside) became hugely viral, cementing 套路 as everyday slang.
